Limiting global warming: Variety of efforts needed ranging from 'Herculean' to the readily actionable, scientists say

Major greenhouse gas-emitting countries agreed in December climate talks held in Copenhagen that substantial action is required to limit the increase of global average temperature to less than 2 degrees C (3.6 degrees F). Climate researchers have identified three avenues by which those countries can avoid reaching the warming threshold, a point beyond which many scientists believe climate change will present unmanageable negative consequences for society.

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