The things that happen are an earthquake, another bomb in Iraq, some big jolt on Wall Street in oil prices, and then you have some new study on drought patterns from climate change. Or another little incremental improvement in photovoltaics. Where do those fit in to the daily stream? They don't.

You never know you're in a bubble until it pops.

Scientists are also unnerved by the summer's implications for the future...proof that human activities are propelling a slide toward climate calamity...humans may have tipped the balance...a particularly harsh jolt to polar bears.

The aspects of global warming that matter most to people - how rapidly will the seas rise? Are hurricanes already getting stronger? How strong will they get as a result of warming? Those are still immersed in complexity. So in those realms that catch people's attention most, or that get used as symbols by environmental campaigners, those facets really do come with significant back-and-forthing.

Probably the single-most concrete and substantive thing an American, young American, could do to lower our carbon footprint is not turning off the lights or driving a Prius, it's having fewer kids...we'll soon see a market in baby-avoidance carbon credits similar to efforts to sell CO2 credits for avoiding deforestation.

The things that happen are an earthquake, another bomb in Iraq, some big jolt on Wall Street in oil prices, and then you have some new study on drought patterns from climate change. Or another little incremental improvement in photovoltaics. Where do those fit in to the daily stream? They don't.

The responsibility of the scientist or journalist is to convey the context. If you're talking about the Arctic Sea ice, you have to embrace the reality that there's a huge number of other things that influence that on a year-to-year basis.