And, can the emerging concept be as rigorous as a footprint?

in ways that could profoundly influence climate change policy

An electric vehicle driven by an Uber or Lyft driver reduces emissions almost three times as much as the same vehicle used as a private car

Nitrous oxide has a climate warming effect 289 times that of carbon dioxide

A cash transfer program for the rural poor in Indonesia also reduced deforestation around participating villages

An economic lab experiment reveals the complexities of governing solar geoengineering

Widespread composting of human waste could both improve health and reduce climate impacts

Emissions cuts in one country or region are likely to lead to increases elsewhere