While deforestation is a major source of global carbon emissions (see previous two posts), the expansion of agriculture into drained organic soils also releases carbon. Wetlands, and especially peatlands, have waterlogged soils. As a result, their soils are depleted of oxygen, preventing decomposition. This means that the carbon in plants and animals is stored in the soils. When these soils are drained, the oxygen returns and organic material decomposes. Decompostion releases the carbon stored in that material. Thus, draining wetland soils releases carbon dioxide and contributes to climate change.
FAO adds emissions from cropland expansion into drained organic soils to deforestation. The result: significant increases in carbon emissions from Indonesia, which has substantial peatlands.
Oyster reefs are in rough shape over much of the world, threatened by over-harvesting in combination with pressures from exotic species (including disease) and pollution. This means those coastal areas are losing the valuable ecosystem services, such as water filtration and protection from storm surges, oyster reefs provide.
Source:
Beck, M. W., Brumbaugh, R. D., Airoldi, L., Carranza, A., Coen, L. D., Crawford,
C.,…Guo, X. (2011). Oyster reefs at risk and recommendations for conservation,
restoration, and management. BioScience, 61(2), 107-116. doi:http://dx.doi.org/10.1525/bio.2011.61.2.5
Conservation status of reptiles, which include snakes, lizards, turtles & tortoises, tuataras and the crocodilians
Climate change is hitting Georgia’s peach industry, where an unusually warm winter this year let to a dramatically reduced peach harvest.
From FiveThirtyEight:
For trees that fruit each year (such as peaches, cherries, blueberries, almonds and other fruits and nuts), cool weather is as important as warm. Cold air and less sunlight trigger the release of chemicals that halt trees’ growth, prepare them to withstand freezing temperatures and enable them to resume growing the following spring. When a tree enters this dormant state, it sets a kind of internal seasonal alarm clock that goes off once the tree has spent enough time in chilly temperatures. This countdown is measured in so-called chill hours — the amount of time the temperature is between 32 and 45 degrees Fahrenheit. When crops don’t get the chill hours they expect, they can’t properly reset. Buds are delayed, and instead of ripening into juicy, delicious fruit, they remain small and underdeveloped.
This last winter, middle Georgia got about 400 chill hours during what Chavez described as the usual dormancy period for peaches (roughly Oct. 1 to Feb. 10). The winter before, while still on the low side, had closer to 600 chill hours. But that 200-hour difference meant several peach varieties that had produced fruit in 2016 never bloomed this year.
As shown in the last image, this reduction in chill hours is not unique to Georgia, and will impact farmers growing fruit and nut trees.
A recent report from the Energy Information Administration found that U.S. plant owners and operators are getting ready to retire 27 gigawatts’ worth of coal generation, or about 8.5 percent of the coal fleet, between now and 2016. Considering the substantial contribution of burning coal to climate change, coal plant retirements are one of the greatest ways to reduce carbon emissions.
As the Trump administration rolls back Obama’s Clean Cars program, meant to increase the fuel efficiency of American cars and light trucks, demand for electric vehicles [EV] - both battery electric (BEV) and plug-in hybrids (PHEV) - is soaring globally.
But as Brad Plumer points out, a good deal of this growth is the result of policy meant to encourage the purchase of electric vehicles and build up EV infrastructure.
As a result, electric vehicles now make up more than 1 percent of sales in China, France, Denmark, and Sweden. They make up 9.7 percent of sales in the Netherlands, and 23 percent of sales in Norway, which offers some of the most generous tax incentives around, worth about $13,500 per car.
Pollution-related mortality in Europe
The environmental blog Mongabay.com created a series of graphs from the IUCN Red List, which evaluates the conservation status of plant and animal species and lists those that are under threat. I'll be posting a series of them from different groups.
The first is the conservation status of herps, or reptiles and amphibians.
Once just an alluring pet, the ravenous lionfish is now a predatory threat to reefs in the Atlantic. Learn more: to.pbs.org/2c3CjnU
Avg. daily precipitation in the U.S. over the course of a year
Source: MetricMaps
A visual exploration of environmental problems, movements and solutions.
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