Suggesting that the planet will soon reach an irreversible "tipping point" of damage to the climate, former Vice President Al Gore told members of Congress on Wednesday that the United States needs to join international talks on a treaty.
"This treaty must be negotiated this year," Gore told the Senate Foreign Relations Committee.
During questioning, he acknowledged that any treaty must include mechanisms to ensure compliance with prospective limits on carbon dioxide emissions, which come primarily from burning fossil fuels for energy.
Committee Chairman John Kerry of Massachusetts said public policy must change and respond to warnings from scientists who fear that a buildup of greenhouse gas emissions may prove permanent.
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