A group of 22 scientists worldwide argue that the Earth is frighteningly close to a tipping point that would send the globe irreversibly into a state that could spell disaster for humans. The group note that human pressures and climate change can irreversibly change local ecosystems. The fear is that Earth faces planet-wide change that will disrupt global animal and plant communities as well as water and food supplies.
In just a few decades shrubs in the Arctic tundra have turned into trees as a result of the warming Arctic climate, creating patches of forest which, if replicated across the tundra, would significantly accelerate global warming.
A geoengineering solution to climate change could lead to significant rainfall reduction in Europe and North America, a team of European scientists concludes. The researchers studied how models of the Earth in a warm, CO2-rich world respond to an artificial reduction in the amount of sunlight reaching the planet’s surface.