Delegates at the Rio+20 earth summit must look beyond CO2 to black carbon. Reducing black carbon (soot) is easier than reducing other kinds of greenhouse gas emissions. And a market-based international system to reduce carbon emissions is already in place.
US government system, using ground sensors and satellite imagery, helped to predict this year's drought in Horn of Africa, allowing aid groups and governments to prepare relief.
Delegates in Durban, South Africa struck a deal to seek a new climate change treaty. Meanwhile, less-contentious projects like a famine early warning system help now.
Climate activists in Durban are expressing their displeasure at negotiators from wealthy countries, whom they see as dragging their feet on curbing greenhouse gas emissions.
Some countries and advocacy groups are saying that the United States is seeking to delay the start of a legally binding climate change deal until after 2020, a charge that the US climate envoy denies.