As I write this in October, there are strong reasons to think that we have arrived at the tipping point of global awareness about climate change and the need to act as a matter of urgency. A recent BBC World Service international survey of more than 22,000 people in 21 countries found that a substantial majority of people—two-thirds of those polled—agreed that "major steps need to be taken soon to address global warming," while 79 percent of respondents believed that "human activity, including industry and transportation, is a significant cause of climate change."
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