November 9th, 2010
03:52 PM ET

iReport daily challenge: #BeAHero for the climate

Editor's Note: Learn about the top 10 CNN Heroes of 2010 and vote for the CNN Hero of the Year at CNNHeroes.com.

In a couple of weeks, mayors from cities around the world will convene at the World Mayors Summit on Climate in Mexico City to pledge their commitment to combating global warming.

Over half of the world's population now live in cities, writes CNN’s Matthew Knight, and they have “an enormous power to demand of their local governments an improvement in their climate policy," says Anke Stoffregen, communications manager for ICLEI – Local Governments for Sustainability, a partner in the conference.

So what are mayors doing to make their cities more livable? What role are they playing in the struggle against global warming?

For the next couple of weeks, we're offering tiny things that you can do to make the world a better place.

Today's "Be A Hero" challenge: Hold cities accountable for climate change.

Record a question for the mayors on video and upload it to iReport or submit a text question in the comments here.

Then we'll get answers. The best questions will be asked at the conference, and the answers will be turned into highlights for CNN International TV and CNN.com/environment.

soundoff (29 Responses)
  1. cesar

    I was a hero Mon night. I went to the dine in and skipped the drive thru and the idling. Tomcat should do the same, SO that he can be a hero too.

    November 9, 2010 at 4:09 pm | Report abuse |
  2. Curtis Shanks

    Man made global warming is a HOAX !!

    November 9, 2010 at 4:53 pm | Report abuse |
    • Diaa

      Did you know that some people were so CERTAIN that the earth was flat that they even killed people over it?

      Just thought I'd remind you.

      November 9, 2010 at 5:01 pm | Report abuse |
    • Me

      Wrong

      November 9, 2010 at 5:09 pm | Report abuse |
    • Bill Sanford

      DIAA... you seem pretty sure that you are on the "right side" of that interpretation. From what I can see, the Global Warmers are faced with a round earth... and calling it flat.

      And that will kill people too.

      November 9, 2010 at 5:50 pm | Report abuse |
  3. LRon

    The globe is a HOAX!

    November 9, 2010 at 5:00 pm | Report abuse |
  4. Rob

    Scientists need to address these points clearly; and there will not be a consensus for action until that is done.

    a. Is the planet getting warmer?

    b. Is humanity the cause of the planet getting warmer?

    c. Is human released CO2 the predominant cause of humans warming the planet?

    d. What is the rate of the planet's warming?

    e. Is the warming of the planet bad for humanity overall in the long term?

    f. What is the suggested plan to mitigate the harm to humanity and what does it cost over what period

    g. What would be the results over what time period if the suggested plan "f" was adopted.

    November 9, 2010 at 5:39 pm | Report abuse |
    • Joshua

      Yea.. this has already all been addressed... over and over and over again. Every legitimate scientific organization recognizes that the earth is warming thousands of times faster than it every has, that manmade CO2 emissions are to blame, and that climate change dramatically threatens all world economies and human health. Several plans have been put forth, none of them will ever be adopted until it is too late.

      November 9, 2010 at 5:54 pm | Report abuse |
    • mixed_signal

      Don't forget: What is the cost of not mitigating climate change ?

      These are not one-sided questions or choices.

      November 9, 2010 at 6:52 pm | Report abuse |
  5. Roger T. Party

    As noted by other media sources, Global Warming is official DOA. BO has given up on it and the Mexico City meeting has the potential for not happening at all. Good riddance.

    November 9, 2010 at 5:57 pm | Report abuse |
  6. Christopher Alan Fields - Muncie Indiana USA

    Absolute Scam, the Earth is Cooling, get ready for Global Cooling.

    November 9, 2010 at 7:24 pm | Report abuse |
    • KyleXR8

      The Earth is decidedly NOT cooling, that's just plain wrong. If you need a primer on plain data, see ClimateHQ.com: http://www.climatehq.com. If you look at the Global Average Temperature data, it's clear that the planet has been warming for the past several decades...and this is coming from multiple, independent, sources of data. The warming simply cannot be denied.

      November 10, 2010 at 4:18 pm | Report abuse |
  7. Robert Zagrodzky

    -Why don't the experts on global warming open the source for their math model that predicted warming?
    -If the earth is warming, why hasn't the Earth warmed dramatically since 1995 because of the billions of tons of carbon dioxide that has been dumped into the atmosphere?
    -What are the data points(temperature measurements) & the location & how are corrections (if any) applied?

    November 9, 2010 at 7:56 pm | Report abuse |
  8. Rob

    My question is for U.S. leaders. If they're so concerned about leaving record deficits to the children of tomorrow, what good will trimming the deficit do them if they live in an uninhabitable planet?

    November 9, 2010 at 8:28 pm | Report abuse |
  9. imemine

    the city I live in has a population 550,000 average annual temperature 63°f but 30 years ago populatin was much smaller at 179,000 and average temperature 61°f , while small towns 20 miles away in all have average temperature 61°f . and 60.8°f today. In summary I have followed weather and climate in my state for 30 plus years and have realised over time only large and more so growing cities have increased in temperatures While small towns nearby ,Temperatures have Remained the Same or Decreased slightly during past 30 years.

    November 9, 2010 at 8:29 pm | Report abuse |
  10. Human Activity Changes the Climate

    Read about Global warming from NASA and forget the "hoax" charlatans.

    http://www.nasa.gov/worldbook/global_warming_worldbook.html

    November 9, 2010 at 8:30 pm | Report abuse |
  11. Rick G

    Why does the climate establishment persist in measuring the official temperature record from thermometers that are nearly all too close to artificial sources of heat?

    What motive could there be, other than to inflate official temperatures?

    Why have we only found out about it because volunteers went out and photographed the official thermometers?

    November 9, 2010 at 8:37 pm | Report abuse |
    • KyleXR8

      Not only have researchers been using satellite data since the late-70s, but the vast majority of temperature data comes from thermometers isolated from urban areas and heat islands. Researchers are only too happy to show heat-island affect data from thermometers located in cities, since it's such a well-known phenomena.

      November 9, 2010 at 9:52 pm | Report abuse |
  12. Rick G

    Why do the climate establishment use the land- thermometer temperatures in their communications with the public, when they could use the satellite data instead?

    Why is there no website showing the latest global ocean temperature as measured by Argo? The western public have paid for this data and it is crucial to the climate debate, so why isn’t it freely available?

    November 9, 2010 at 8:38 pm | Report abuse |
    • NOLADoug

      http://www.usgodae.org/argo/argo.html

      November 9, 2010 at 9:01 pm | Report abuse |
    • KyleXR8

      Climatologists have been using satellite-based data extensively since the late-1970s.

      November 9, 2010 at 9:46 pm | Report abuse |
  13. Rick G

    The current global warming trend started before 1700, yet human CO2 emissions were negligible before 1850. So the theory that humans started the recent global warming is absurd and obviously wrong.

    Have you ever seen a graph of human CO2 emissions versus temperature (the alleged cause and effect) anywhere in the media or from the climate establishment? Why not?

    Why do the climate establishment and mainstream media instead show us graphs of atmospheric CO2 levels versus temperature? Isn’t this misdirection to disguise the almost complete non-correlation between our emissions and the temperature?

    November 9, 2010 at 8:39 pm | Report abuse |
    • KyleXR8

      Wrong – it did not start before 1700. That period was, in fact, quite cool compared to today. And, yes, there are plentiful graphs showing the correlation between CO2 in the atmosphere and human emissions – see ClimateHQ.com for the non-partisan basics.

      November 9, 2010 at 9:43 pm | Report abuse |
  14. Rick G

    There has been no significant global warming since 1998. Yet a quarter of all anthropogenic carbon dioxide emissions have occurred since then. If our emissions cause global warming, how come the last 25% of our emissions, concentrated in just 12 years, have not caused further global warming?

    November 9, 2010 at 8:40 pm | Report abuse |
    • KyleXR8

      Wrong, wrong and wrong again. The planet has been steadily warming over the past several decades. 1998 saw a spike in global temps due to a particularly strong El Nino that moved a lot of built-up ocean heat into the atmosphere (global temps have since risen to above their 1998 levels). Gee, Rick, where do you think that heat came from? Thin air? Rick, you need a basic education in science and climate science in particular.

      November 9, 2010 at 9:38 pm | Report abuse |
    • MR

      Rick,
      Let's have a look at your points and see if there is somewhere that you could have been misled. If you agree that this has been the case perhaps you might open up to the possibility that all of these scientists around the world are not all involved in a global conspiracy, but rather are just providing evidence based on their research.

      "No warming since 1998" -- "why use land thermometers instead of satellitte" – We can do both of these at once because they are related to the same misunderstood information whose source is often Vangel Vesovski (VV). VV uses one of the two major satellite temperature series (called UAH), and isolates 11 years of the data starting in 1998 to allegedly show a cooling trend. Why does he pick 1998 as his starting point? Because it was the year of the largest El Nino on record and an outlier in terms of how much warmer that year was compared to the following 11 years. Two problems there: one is that VV is cherry picking the data by isolating only 11 years (the World Meteorlogical Org states that 30 years is the minimum timeframe necessary to define climate). The other is that if you take thirty years of data from the same satellite temperature series UAH (1978-2009) you actually do get a statistically significant warming trend. Look it up. So the satelllite data actually does support the same findings as the land thermometers).

      November 9, 2010 at 9:51 pm | Report abuse |
  15. TheEarthWasWarmerWhen

    Uh....Scientists report it was warmer when Dinosaurs Roamed the Earth. Oh, must have been all that friction from Fred's feet in the Flintstone Mobile. Hold on a minute wasn't there a thing with the ice age meltdown? Let me guess....Penguin gas. GLOBAL SCAM SUCKERS!

    November 9, 2010 at 10:45 pm | Report abuse |
    • KyleXR8

      Uh...irrelevant. Whether the Earth was warmer or cooler millions of years ago means nothing. The scale and rate of what's happening today is much more important, and whether or not ecosystems and our infrastructure can keep up with the changes.

      November 10, 2010 at 10:51 am | Report abuse |
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