Most agriculture in the southwestern U.S. is already marginal, possible only because U.S. taxpayers support cheap water for questionable crops. And because of global warming, the outlook is grim as the region continues to warm and dry.
By 2050, Arizona cotton production will drop to less than 10 percent of the crop yield under optimal irrigation conditions, a new MIT study projects. Similarly, maize grown in Utah, now only yielding 40 percent of the optimal expected yield, will decrease to 10 percent with further climate-driven water deficits. Continue reading “Global warming will devastate marginal farming areas”→
Farmers have known it for generations that heatwaves, drought and extreme rain are a bad recipe for growing wheat, and now scientists have quantified those impacts. Heat stress, combined with drought or excessive rain is responsible for about 40 percent of the changes in wheat yields from one year to another.
That’s bad news in a world that’s expecting extreme weather to intensify in the coming decades, but at least the stress index developed scientists with the European Joint Research Centre will help communities plan ahead and ameliorate at least some climate change impacts. Continue reading “Climate extremes have big effect on wheat yields”→
New research focuses on biophysical impacts of climate change
Vegetation plays a key role in the climate change equation, with a recent study showing that vegetation density has substantial climate impacts. According to the research by the European Union’s Joint Research Center, the findings show that vegetation has a warming effect in cold areas and cooling effect in warm areas.
Figuring out the net effect would help develop more integrated and effective climate mitigation and adaptation strategies. The puzzle is complex. Increasing greenhouse gases spur vegetation growth, but the overall effects at the global level are not clear. The new study explores how changes in leaf area (a measure of vegetation density) affect local climate. Continue reading “Increased greening amplifies global warming in boreal zones”→
Some wildflower love from Austria spanning the last couple of months, from first sprouts emerging through the remnant muck of winter, to forest orchids. Check out the Summit Voice photo archives for more wildflower shots from around the world, and visit our online gallery to purchase fine art nature and landscape prints.
Many wildflower species are under the gun from climate change, especially in the mountains, where they will be pushed out of their habitat. Other studies have documented how global warming will affect native plant diversity in California. The changes to plant communities will ripple through ecosystems, affecting insect and birds, as many studies have shown.
Ice age ocean current disruptions linked with greenhouse gas changes
Scientists say they’ve discovered another huge climate warning sign in the Arctic. Past increases in CO2 levels in the air drove ocean currents to a tipping point had a big impact on hemispheric weather patterns.
Global warming was first identified as a potential threat to sea turtles in the 1980s because the temperature at which the eggs incubate helps determine the sex of the embryos. A new study now adds weight to those concerns, finding that warmer temperatures could lead to higher numbers of female sea turtles and increased nest failure, negatively on the turtle population in some areas of the world. Continue reading “Global warming puts sea turtles at risk”→
Electric cars are likely to reach mass market adoption within the next decade, according to the International Energy Agency’s latest report on e-mobility. In 2016, the number of electric cars on the road globally reached 2 million, with China accounting for 40 percent of that total.
China has also deployed more than 200 million electric two-wheelers, as well as 300,000 elecric buses and leads the globe in electrification of the transport sector. China, the US and Europe made up the three main markets, totalling over 90 percent of all electric vehicles sold around the world.