Pre-industrial

John Kerry, Biden’s climate envoy, said that more than half the world’s economy has now pledged action to stop warming at 1.5 degrees Celsius above pre-industrial levels, a goal set by the 2015 Paris Agreement.

The IPCC report warns that global average temperatures will hit 1.5 degrees Celsius above pre-industrial levels by 2030 on current trajectories, the limit agreed at the Paris climate summit in 2015 — and seen as a tipping point by many scientists. That’s 10 years earlier than previous forecasts.

The International Energy Agency has said all new crude oil, natural gas and coal projects will have to be shelved, if the world is to keep the global temperature rise within 2°C compared with the pre-industrial level.

Nearly all nations have signed on to the Paris climate agreement, which pledges to keep global warming to less than a global average of 2 degrees Celsius above pre-industrial levels, and ideally below 1.5 degrees.

Researchers cultured Eastern and Suminoe oysters in water that was held to four separate CO₂ concentrations, reflecting atmospheric conditions during pre-industrial times, acidity levels today and those predicted for 50 and 100 years from now.