Environmental activists of Swiss Klimastreik Schweiz movement placed shoes in place of live participants to demonstrate over climate crisis in Zurich, Switzerland, April 24, 2020.
But dangerous thresholds are closer than once thought, and dire consequences stemming from decades of unbridled carbon pollution are unavoidable in the short term. And it shows that even as we spew record amounts of greenhouse gases into the atmosphere, we are undermining the capacity of forests and oceans to absorb them, turning our greatest natural allies in the fight against warming into enemies.
A decade ago, scientists believed that limiting global warming to two degrees Celsius above mid-19th century levels would be enough to safeguard our future. A warming world has also increased the length of fire seasons, doubled potential burnable areas, and contributed to food systems losses.The world must face up to this reality and prepare for the onslaught — a second major takeaway of the report.Mid-century projections — even under an optimistic scenario of two degrees Celsius of warming — make this an understatement.
That extra half-a-degree will also mean 420 million more people exposed to extreme and potentially lethal heatwaves. Other tipping points could see the Amazon basin morph from tropical forest to savannah, and billions of tonnes of carbon leech from Siberia's permafrost, fuelling further warming. There is no easy solution to such a tangle of problems, said Nicholas Stern, former chief economist at the World Bank and author of the landmark Stern Review on the Economics of Climate Change.
Even at the coveted global warming cap of 1.5C, 'conditions will change beyond many organisms' ability to adapt,' says a draft IPCC report, contributing to food systems losses and accelerating impacts that will be felt before a child born today turns 30
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