Earth may be nearing an ecological tipping point that threatens biodiversity, food production and water supplies as humans consume resources at an unsustainable pace, according to an article published in the journal Nature. About 43 percent of the Earth’s surface has been built upon or is being used for agriculture to support the planet’s 7…
About 12 million years ago, Earth wasn’t sensitive to carbon dioxide ups and downs. But like seasonal allergies that develop when one gets older, the planet’s climate has started responding to changing CO2 concentrations relatively recently, according to new findings from paleoclimate researchers. The prevailing understanding in climate science is that there’s been a persistent…
Watching the sunset from the cliffs of the Santorini caldera attracts tourists from all over the world, I recently discovered on a family sailing trip in the Greek Islands. The Cyclades archipelago is one of the cradles of human civilization, dating back 6,000 years, when late Neolithic and early Bronze Age communities thrived here. They…
The mysterious fall of the largest of the world’s earliest urban civilizations nearly 4,000 years ago in what is now India, Pakistan, Nepal and Bangladesh now appears to have a key culprit — ancient climate change, researchers say. Ancient Egypt and Mesopotamia may be the best known of the first great urban cultures, but the…
The Earth’s greatest mass extinction, 250 million years ago, was so severe that it took 10 million years for the planet to recover. Life was nearly wiped out, with only 10% of plants and animals surviving. And the sheer intensity of the crisis, and continuing grim conditions on Earth after the first wave of extinction,…
Adapted from The Fate of the Species: Why the Human Race May Cause Its Own Extinction and How We Can Stop It, by Fred Guterl (Bloomsbury USA, 2012) NASA climate scientist James Hanson has warned of a “Venus effect,” in which runaway warming turns Earth into an uninhabitable desert, with a surface temperature high enough to melt…
Four decades ago, a Massachusetts Institute of Technology computer model called World3 warned of a possible catastrophic course for human civilization in the 21st century – a collapse of socioeconomic order and massive drop in human population. In Limits to Growth, a bitterly disputed 1972 book that explicated these findings, researchers argued that the global…
Throughout the world, climate change is causing age-old ecological partners to miss their cues as seasons shift. The trend may be so strong at higher latitudes that researchers now propose that some species’ ranges could actually shrink away from the poles. This idea comes from studying broad-tailed hummingbirds that migrate north from Central America each…
Scientists have identified thousands of sites in the Arctic where methane that has been stored for many millennia is bubbling into the atmosphere. The methane has been trapped by ice, but is able to escape as the ice melts. Writing in the journal Nature Geoscience, the researchers say this ancient gas could have a significant…
As the climate changes over the next century, the ranges of nearly 90% of mammal species will shrink – in many cases because animals won’t be able to get to areas where the climate is going to become suitable for them, says new research. Across the Western Hemisphere, the study also found, nearly 10% of…