Quotes About Impact

As the effects of global warming become more and more difficult to ignore, will we react by finally fashioning a global response? Or will we retreat into ever narrower and more destructive forms of self-interest? It may seem impossible to imagine that a technologically advanced society could choose, in essence, to destroy itself, but that is what we are now in the process of doing.

If we assume, very conservatively, that there are two million species in the tropical rainforests, this means that something like five thousand species are being lost each year. This comes to roughly fourteen species a day, or one every hundred minutes.

Human activity has transformed between a third and a half of the land surface of the planet. • Most of the world's major rivers have been dammed or diverted. • Fertilizer plants produce more nitrogen than is fixed naturally by all terrestrial ecosystems. • Fisheries remove more than a third of the primary production of the oceans' coastal waters. • Humans use more than half of the world's readily accessible fresh water runoff.

Everything (and everyone) alive today is descended from an organism that somehow survived the impact. But it does not follow from this that they (or we) are any better adapted. In times of extreme stress, the whole concept of fitness, at least in a Darwinian sense, loses its meaning: how could a creature be adapted, either well or ill, for conditions it has never before encountered in its entire evolutionary history?

We have to face the quantitative nature of the challenge," he told me one day over lunch at the NYU faculty club. "Right now, we're going to just burn everything up; we're going to heat the atmosphere to the temperature it was in the Cretaceous, when there were crocodiles at the poles. And then everything will collapse.

The current extinction has its own novel cause: not an asteroid or a massive volcanic eruption but "one weedy species". (...) We're seeing right now that a mass extinction can be caused by human beings.

every year more non-indigenous species of mammals, birds, amphibians, turtles, lizards, and snakes are brought into the U.S. than the country has native species of these groups.

The size of the greenhouse forcing is estimated, at this point, to be 2.5 w/m2. A miniature Christmas light gives off about four tenths of a watt of energy, mostly in the form of heat, so that, in effect (as Sophie supposedly explained to Connor), we have covered the earth with tiny bulbs, six for every square meter. These bulbs are burning twenty-four hours a day, seven days a week, year in and year out.

It demonstrates, he has written, that humans "are capable of driving virtually any large mammal species extinct, even though they are also capable of going to great lengths to guarantee that they do not.

that a molecule of CO2 generated by burning fossil fuels will, in the course of its lifetime in the atmosphere, trap a hundred thousand times more heat than was released in producing it.

Meanwhile, an even stranger and more radical transformation is under way. Having discovered subterranean reserves of energy, humans begin to change the composition of the atmosphere.

on Easter Island concluded that it wasn't humans who deforested the landscape; rather, it was the rats

oceans' surface waters has already dropped, from an average of around 8.2 to an average of around 8.1. Like the Richter scale, the pH scale is logarithmic, so even such a small numerical difference represents a very large real-world change. A decline of .1 means that the oceans are now thirty percent more acidic than they were in 1800.

this will, in turn, trigger a variety of world-altering events, including the disappearance of most remaining glaciers, the inundation of low-lying islands and coastal cities, and the melting of the Arctic ice cap.

There is every reason to believe that if humans had not arrived on the scene, the Neanderthals would be there still, along with the wild horses and the woolly rhinos. With the capacity to represent the world in signs and symbols comes the capacity to change it, which, as it happens, is also the capacity to destroy it.

The whole new layer on top of what I was thinking about in the nineteen-seventies is climate change," Lovejoy told me. He has written that "in the face of climatic change, even natural climatic change, human activity has created an obstacle course for the dispersal of biodiversity," the result of which could be "one of the greatest biotic crises of all time.

Assuming that humans continue to burn fossil fuels, the oceans will continue to absorb carbon dioxide and will become increasingly acidified.

Researchers now believe it won't last out the Anthropocene. "It is likely that reefs will be the first major ecosystem in the modern era to become ecologically extinct

Atmospheric warming, ocean warming, ocean acidification, sea-level rise, deglaciation, desertification, eutrophication—these are just some of the by-products of our species's success. Such is the pace of what is blandly labeled "global change" that there are only a handful of comparable examples in earth's history, the most recent being the asteroid impact that ended the reign of the dinosaurs, sixty-six million years ago.

Under business as usual, by mid-century things are looking rather grim," he told me a few hours after I had arrived at One Tree. We were sitting at a beat-up picnic table, looking out over the heartbreaking blue of the Coral Sea. The island's large and boisterous population of terns was screaming in the background. Caldeira paused: "I mean, they're looking grim already.

The paper concluded that if current emissions trends continue, within the next fifty years or so "all coral reefs will cease to grow and start to dissolve.

When the world changes faster than species can adapt, many fall out. This is the case whether the agent drops from the sky in a fiery streak or drives to work in a Honda.

As best as can be determined, the world is now warmer than it has been at any point in the last two millennia, and, if current trends continue, by the end of the century it will likely be hotter than at any point in the last two million years.

the crisis Cuvier discerned just beyond the edge of recorded history was us.