A: According to reports:The evidence that humans are causing global warming is strong, but the question of what to do about it remains controversial. 

B: Economics, sociology, and politics are all important factors in planning for the future.

A: Even if we stopped emitting greenhouse gases (GHGs) today, the Earth would still warm by another degree Fahrenheit or so. But what we do from today forward makes a big difference.  

B: Many people and governments are already working hard to cut greenhouse gases, and everyone can help.

A: There are many possible wedges, including improvements to energy efficiency and vehicle fuel economy, and increases in wind and solar power, hydrogen produced from renewable sources, biofuels, natural gas, and nuclear power.  

B: There is also the potential to capture the carbon dioxide emitted from fossil fuels and store it underground—a process called "carbon sequestration."

A: In addition to reducing the gases we emit to the atmosphere, we can also increase the amount of gases we take out of the atmosphere.  Increasing forestlands and making changes to the way we farm could increase the amount of carbon we're storing.

B: Some of these technologies have drawbacks, and different communities will make different decisions about how to power their lives, but the good news is that there are a variety of options to put us on a path toward a stable climate.