Scientists and policymakers use measurements like global warming potential to compare how varying greenhouse gases, like carbon dioxide and methane, contribute to climate change.
Severe air pollution has plagued China's industrial regions in recent decades, a situation that has received worldwide attention thanks to photos of Beijing and other smog-blanketed Chinese cities.
Jane Baldwin, a Ph.D.
Maya Buchanan, a Ph.D.
The government of a low-lying island nation is considering the construction of a seawall to protect its capital and economic hub from the rising seas brought on by climate change. The length and expense of the project depends on how high the wall needs to be — 3 feet? Four?
Responding to the challenges of climate change depends both on scientific assessment as well as value judgments by citizens, academics and policymakers.
Issues related to the environment and climate change will demand the new president's attention soon after he or she takes office Jan. 20 and throughout the next four years.
After years of environmental destruction, China has spent billions of dollars on the world's largest reforestation program, converting a combined area nearly the size of New York and Pennsylvania back to forest.
Beijing and surrounding areas of China often suffer from choking smog. The Chinese government has made commitments to improve air quality and has achieved notable results in reducing emissions from the power and transportation sectors.