Researchers are unsure how far they should push "geoengineering" experiments.
Courts could break stalemate on climate talks, California climate bill veto, and LED lamps make for easier driving in a Dutch tunnel.
A California project foreshadows hard choices for coastal cities weighing benefits and costs of new development.
DAILY CLIMATE - In the carbon market, a good deal for the environment needs to also be a good deal for the bottom line. Vouching for environmental credibility isn't easy: Who verifies the verifiers?
DAILY CLIMATE - The market for greenhouse gas emissions is essentially a bazaar selling various types of pollution, dependent entirely on government regulations. But does it actually reduce emissions?
DAILY CLIMATE - What does it take to trade in a commodity that cannot be seen or touched - and isn't even a commodity in the U.S.?