Word: planet
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Dates: during 2000-2009
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...world attempts to break the carbon addiction that already has it well on the way to climate catastrophe, more clearly defined limits will be useful. But climate diplomats should remember that while they can negotiate with one another, ultimately, they can't negotiate with the planet. Unless we manage our presence on Earth better, we may soon be in the last days of our Long Summer...
...leaders to think short term, to make the hard pledges that are required to start bringing global carbon emissions down. They can start at Copenhagen. And they should remember the words of Mohamed Nasheed, the President of the Maldives, whose small island country literally risks being erased from the planet by rising sea levels. "We are talking about not living because of climate change," he said on Sept. 21. "We are going to die. Don't do this to us." Not as eloquent as Obama's words - but far more urgent...
...scientific name is the Holocene Age, but climatologists like to call our current climatic phase the Long Summer. The history of Earth's climate has rarely been smooth. From the moment life began on the planet billions of years ago, the climate has swung drastically and often abruptly from one state to another - from tropical swamp to frozen ice age. Over the past 10,000 years, however, the climate has remained remarkably stable by historical standards: not too warm and not too cold, or Goldilocks weather. That stability has allowed Homo sapiens, numbering perhaps just a few million...
...planetary boundaries that Rockstrom identifies in the paper. Other boundaries involve freshwater overuse, the global agricultural cycle and ozone loss. In each case, he scans the state of science to find ecological limits that we can't violate, lest we risk passing a tipping point that could throw the planet out of whack for human beings. It's based on a theory that ecological change occurs not so much cumulatively, but suddenly, after invisible thresholds have been reached. Stay within the lines, and we might just be all right...
...felt the full effects, Rockstrom says, because carbon acts gradually on the climate - but once warming starts, it may prove hard to stop unless we reduce emissions sharply. Ditto for the nitrogen cycle, where industrialized agriculture already has humanity pouring more chemicals into the land and oceans than the planet can process, and for wildlife loss, where we risk biological collapse. "We can say with some confidence that Earth cannot sustain the current rate of loss without significant erosion of ecosystem resilience," says Rockstrom...