Debate on Climate Shifts to Issue of Irreparable Change

Debate on Climate Shifts to Issue of Irreparable Change: "This 'tipping point' scenario has begun to consume many prominent researchers in the United States and abroad, because the answer could determine how drastically countries need to reduce their greenhouse gas emissions in the coming years. While scientists remain uncertain when such a point might occur, many say it is urgent that policymakers cut global carbon dioxide emissions in half over the next 50 years or risk the triggering of changes that would be irreversible."