Global warming has already left its mark on the backbone of California’s water supply, and represents a growing threat to its first developed agricultural region, state experts have warned in a new study.
The Sacramento-San Joaquin Delta fuels California’s $3 trillion economy, including its $50 billion agricultural industry, sustains more than 750 plant and animal species and supplies 27 million people with drinking water.
The snowpack in Colorado’s mountains has reached 93% of normal, federal survey data showed Tuesday — lagging slightly at the moment when cities and food growers decide whether water supplies will be sufficient for crops, cattle and a growing population. While recent heavy snow bodes well, measured in relation to the norm between 1981 and 2010, federal forecasters on Tuesday also warned they’re expecting “below normal” water flows in streams and rivers once snow melts due to decades of mostly increasing aridity.
Picture the desert landscape of a Mad Max movie populated with vigilantes devoted to acquiring not gasoline — but water. This scenario isn’t as far-fetched as you might think. “Water wars” describes conflicts between countries, states, or groups over the right to access water resources, usually freshwater. Freshwater is necessary for drinking, irrigation, and electricity generation, and conflicts occur when the demand for potable water exceeds the supply, or when allocation or control of water is disputed.
Earth’s rising fever hit or neared record hot temperature levels in 2020, global weather groups reported Thursday.
While NASA and a couple of other measurement groups said 2020 passed or essentially tied 2016 as the hottest year on record, more agencies, including the National Oceanic Atmospheric Administration, said last year came in a close second or third. The differences in rankings mostly turned on how scientists accounted for data gaps in the Arctic, which is warming faster than the rest of the globe.
Global warming pushed temperatures into record territory in 2020, in effect tying 2016 as the hottest year on record, according to data released Thursday by U.S. science agencies.
Last year’s average global surface temperature was 2.2 degrees Fahrenheit above the late 19th century average, according to NASA. It was the fifth consecutive year of more than 2 degrees above that base line. Indeed, the seven hottest years in 140 years of record keeping are the last seven. In descending record order, they are 2020 and 2016, 2019, 2017, 2015, 2018 and 2014.
The world’s oceans reached their hottest level in recorded history in 2020, supercharging the extreme weather impacts of the climate emergency, scientists have reported.
More than 90% of the heat trapped by carbon emissions is absorbed by the oceans, making their warmth an undeniable signal of the accelerating crisis. The researchers found the five hottest years in the oceans had occurred since 2015, and that the rate of heating since 1986 was eight times higher than that from 1960-85.
In 2020, Californians endured the hottest August, September and October since 1895. Climate scientists warn the trends are evidence of a warming planet. Rising temperatures combined with less rain and high winds have worsened the chance of extreme fire weather.
Climate concerns took a bit of a backseat in 2020. These are the local plans and problems that policymakers might turn their attention to in 2021.
Parts of the world economy may have been on pause during 2020, dampening greenhouse gas emissions for a while. But that didn’t slow the overall buildup of atmospheric carbon dioxide, which reached its highest level in millions of years.
If anything, research during the year showed global warming is accelerating. Symptoms of the fever include off-the-charts heat waves on land and in the oceans, and a hyperactive and destructive Atlantic hurricane season.
Just how warm Earth stays this December will determine if 2020 goes down as the hottest year on record. And it’s looking a lot like it will.
The National Oceanic and Atmospheric Administration calculated Monday that last month globally was the second hottest November on record, behind only 2015. Yet NASA and a European climate monitoring group said it was the hottest November on record. NASA has coverage over the poles that NOAA does not — and both the Arctic and Antarctic were very warm in November, NOAA climate scientist Ahira Sanchez-Lugo said to explain the difference.
