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Low level cloud decline a key driver of last year’s record heat

A dearth of low-lying clouds has been cited as a major cause of unusually high temperatures over the past year, according to a recent study published in the journal Science.

Last year’s heat (the hottest on record) was also fueled by natural climate patterns such as El Nino and pollution from the use of fossil fuels, but scientists say it wasn’t the only cause.

The event was due to a significant reduction in low-lying clouds over oceans which diminished the Earth’s albedo—its ability to reflect sunlight. This decline, influenced by pollution and global warming itself, poses alarming implications for future temperature rises, the study says.

The Earth’s albedo has been declining since the 1970s, according to the report, due in part to the melting of light-coloured snow and sea ice, exposing darker land and water, which absorb more of the sun’s energy, heating up the planet.

The discovery was made when scientists delved into NASA satellite data, weather data and climate models.

In simple terms, fewer bright, low clouds mean the planet “has darkened,” allowing it to absorb more sunlight, said Helge Goessling, a report author and climate physicist at the Alfred Wegener Institute in Germany, told CNN.

However, the study doesn’t fully explain exactly why. That says Wegener is ‘the beast’ they’re still trying to unravel.

Low-level clouds tend to thrive in a cool and moist lower atmosphere. As the planet’s surface heats up, this can cause them to thin or dissipate entirely, setting up a complicated feedback loop where low clouds disappear because of global warming, which drives further warming.

Goessling says the decrease in low-level clouds could also partly be due to a drop in coal burning and stricter controls on marine shipping exhaust. The fine particles in such pollution act as seeds for forming clouds.

The irony is that as we clean up the air, we may also unleash more climate change. Fewer clouds reflecting less sunlight means more warming.

If this is happening, future warming projections may be underestimated and “we should expect rather intense warming in the future,” Goessling said.

WFL
WFLhttp://wholefoodliving.life
Whole Food Living reviews and selects material from a wide variety of international sources. Our primary focus covers food, health and environment. We publish fact checked official announcements made as the result of formal studies conducted by Universities, respected health care organisations, journals, and scientists around the globe.
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