Chances of the planet passing the 1.5C threshold of warming soon are 50:50
The report warns that at least one year between 2022 and 2026 will surpass the 1.5C mark and that there is a 93% chance that the period will see the warmest year on record. It’s also almost certain that, on average, the next five years will be hotter than the last five.
In 2015, the chances of world temperatures temporarily exceeding 1.5C over the next five years were close to zero. Those odds have been inching up ever since as humans continue to emit greenhouse gas, primarily from the use of fossil fuels.
Scientists have warned that the world needs to limit global warming to 1.5C above the temperatures experienced before industrialization to avoid the more catastrophic effects of the climate crisis. In 2015, most of the world signed onto the Paris Agreement, aiming to limit temperature rise to 2C, but preferably 1.5C.
The world is already at least 1.1 degrees Celsius warmer than it was before industrialization.
“The 1.5°C figure is not some random statistic,” he added. “It is rather an indicator of the point at which climate impacts will become increasingly harmful for people and indeed the entire planet.”
Even at 1.5C, many of the world’s coral reefs will be wiped out, and permafrost in some places could reach a tipping point. Permafrost is “permanently” frozen ground that lies under much of the Arctic, keeping huge stores of carbon dioxide (CO2) locked away. As it melts in warmer temperatures, it releases CO2 and adds to climate change.
“A single year of exceedance above 1.5°C does not mean we have breached the iconic threshold of the Paris Agreement,” said Leon Hermanson from the UK’s Met Office, which led the report, “but it does reveal that we are edging ever closer to a situation where 1.5 °C could be exceeded for an extended period.”
In California, which is entirely in drought conditions, two of the state’s largest reservoirs — Shasta Lake and Lake Oroville — are at “critically low levels,” according to the US Drought Monitor.
“For as long as we continue to emit greenhouse gases, temperatures will continue to rise,” Taalas said.
“And alongside that, our oceans will continue to become warmer and more acidic, sea ice and glaciers will continue to melt, sea level will continue to rise and our weather will become more extreme. Arctic warming is disproportionately high and what happens in the Arctic affects all of us.”
The report highlights how fast humans are warming the planet, said Andrew King, a lecturer in Climate Science at the University of Melbourne.
“Our greenhouse gas emissions are still at near-record highs and until we get emissions down to net-zero, we’re going to continue to see global warming,” he said.
Net zero refers to a state where the world reduces its greenhouse gas emissions as much as possible, and offsets any that are hard to avoid, whether through the use of technology or tree-planting to capture carbon dioxide from the atmosphere.
King added: “If we fail to take that action we will have much worse heatwaves and bushfire conditions as well as coral reefs that have been decimated beyond recognition.”
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