Emissions are putting species in lethal danger

Emissions are putting species in lethal danger

Global warming is going to be very bad for the boreal forests of Siberia and Canada, calamitous for the coral reefs of the tropics and the cold deep waters – and lethal for the lizards of North America.

New research warns that the double assault of warmer and increasingly acidic oceans will affect coral reefs everywhere, growing conditions will move north faster than trees can migrate, and increasing extremes of heat will roast vulnerable reptile embryos to death.

As humankind pours more and more carbon dioxide into the planetary atmosphere as a consequence of fossil fuel combustion, these are among the impacts scientists say we should prepare for by 2100 and perhaps even earlier.

About one-third of the planet’s woodlands are strewn across Europe, Scandinavia, Russia, Alaska and Canada. These forests are a “sink” for atmospheric carbon, and at the same time they provide shelter for rich ecosystems and a source of income for tens of millions of people around the world.

But the climate is changing. The region of the northern forests is warming at 0.5°C per decade, and by 2100 it could be on average between 6°C and 11°C higher that it is now. The climate zone is shifting at least 10 times faster than trees can migrate, according to a new study in Science journal.

The likelihood is that the species to the south will be at greater risk of wildfire, drought, infection and insect assault, but the species at the northern fringe will not be able to colonise new ground to keep up. The loss of forest could accelerate global warming even further, although researchers cannot yet be sure.

“These forests evolved under cold conditions, and we do not know enough about the impacts of warming on their resilience and buffering capacity,” says one of the report’s co-authors, Anatoly Shvidenko, a senior researcher in the forestry programme at the International Institute for Applied Systems Analysis in Austria.

 

Source: Climate news network

Date: September 2015

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