Guardian: This week, I will witness a key test of whether we will betray our children, grandchildren and future generations through a lack of ambition and will. I will be at the headquarters of the United Nations in New York on Thursday to listen to David Cameron, Barack Obama and more than 120 other political leaders outline how they intend to tackle the growing risks from climate change.
The summit has been called by the United Nations secretary general, Ban Ki-moon, to try to build high-level support...