Dire conclusions for oceans in new climate report

Понедельник, 30 Сен, 2019

You know what an ocean is, but do you know what the cryosphere is?

The ocean and the cryosphere (the frozen parts of the planet) play a critical role for life on Earth, The IPCC special report said.

The overwhelming majority of marine heatwaves, 84%-90%, has also been attributed to human-caused climate change. I've read the entire 45-page summary for policymakers, and now summarizing the highlights for you here.

The IPCC increased its projected end-of-century sea level rise in the worst-case scenario by almost 4 inches (10 centimeters) from its 2013 projections because of the increased recent melting of ice sheets in Greenland and Antarctica. The spread of sea ice at the end of the summer melt season this year was at its second lowest on record, a situation "unprecedented for 1,000 years at least".

Arctic and boreal permafrost hold vast amounts of ancient carbon and could significantly increase the concentration of greenhouse gases in the atmosphere if they thaw.

At issue is what might have been a routine reference to the October 2018 on the feasibility of capping global warming at 1.5 degrees Celsius. But the new United Nations report says the ocean has absorbed more than 90 percent of the extra heat generated since the 1970s, and it can't keep up.

The increase in warming of oceans and the rise in sea level combined would also affect marine life, and could lead to widespread death of marine population, which in turn would lead to a seafood crisis and cyclones, according to the report.

By declaring a Climate Emergency, Kenora council acknowledges and recognizes the projected effect of climate change locally on the environment as well as economic development in the forestry, mining and tourism sectors.

One of the world's most respected scientific journals, Nature, has asked researchers to retract an article on ocean warming and its link to changes in atmospheric O2 and Carbon dioxide composition, citing systematic errors in the study nearly a year after it was initially published.

These changes are leading to a variety of problems including biodiversity and habitat loss, sea-level rise, irreversible feedback loops, problems linked to food security and water access, and the elimination of communities that are unable to adapt. As a result of which, the coastal cities experience regular flooding due to high tides in the sea.

Around 10% of the Earth is covered by glaciers and ice sheets, and these are melting at an alarming rate.

The Greenland and Antarctic Ice Sheets are projected to lose mass at an increasing rate throughout the 21st century and beyond, and the report's authors state this with high confidence.

"The IPCC does not judge the action of world leaders but the fact that this report was called for.is an indication of the extent to which science is becoming central to choosing pathways to a more sustainable future", IPCC co-chair Debra Roberts said. Other measures, such as building flood defence mechanisms serve only as temporary measures, and will not be able to handle the future sea level rises.

"What this report is telling us is sea level rise is happening at a faster and faster level than we keep anticipating". In the next 80 years, the sea level could increased by up to 60 centimeters if greenhouse gas emissions are dramatically reduced, and 110 centimeters if they are not.

The authors of the report said that numerous deadly cases that are projected in their report can be avoided if the world controls its emission of gases responsible for global warming. "Each of these studies cited by the IPCC alone might not be groundbreaking, but together they send an important message: that we need to do something about carbon".