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Carbon dioxide is the gas most discussed in relation to manmade climate change. But there are other gases responsible for the greenhouse effect that climate scientists blame for global warming.

Scientists say the presence of one of those gases, methane, can be expected to rise rapidly, should the planet continue to warm. That's bad news, since methane -- already the third most abundant greenhouse gas -- has roughly 30 times the heat-trapping potency of CO2.

Scientists have known for some time that methane is a byproduct of biological activity in the world's freshwater ecosystems. Microorganisms in freshwater lakes, rivers, ponds, and streams produce methane as they digest organic materials.

A typhoon hits the Philippines, decimating the fishing industry. Drought in Brazil’s breadbasket region ruins the coffee harvest and market prices double. Changing rainfall patterns cause the loss of 80 percent of Guatemala’s corn harvest; the smaller harvest means fewer jobs, higher unemployment. California -- the largest producer of fruits, vegetables, and nuts in the U.S. -- is hit by the worst drought in 100 years, decreasing crop yields, increasing market prices, and putting pressure on farmers.

This is not the imagined paucity climate change may bring, rather, this is happening now, according to Oxfam.

People in coastal regions of Asia, particularly those living in cities, could face some of the worst effects of global warming, climate experts will warn this week. Hundreds of millions of people are likely to lose their homes as flooding, famine and rising sea levels sweep the region, one of the most vulnerable on Earth to the impact of global warming, the UN states.

The report – Climate Change 2014: Impacts, Adaptation and Vulnerability – makes it clear that for the first half of this century countries such as the UK will avoid the worst impacts of climate change, triggered by rising carbon dioxide levels in the atmosphere. By contrast, people living in developing countries in low latitudes, particularly those along the coast of Asia, will suffer the most, especially those living in crowded cities.

[On March 24, 1989] more than 11 million gallons of black crude gushed into the pristine waters of Prince William Sound.

...Oil reached beaches 650 miles away. Killer whales, eagles, otters, seals and thousands of sea birds died excruciating deaths while Alaska's famous salmon and herring were ruined. The pictures of distressed animals expiring and grief-stricken locals trying to scrub beaches coated with toxic filth shocked the world.

The event is still seared into the minds of those who witnessed it, even a quarter of a century later. But the Exxon Valdez has left more than memories.

A new report by Oceana exposes nine U.S. fisheries that throw away half of what they catch, and kill dolphins, sea turtles, whales, and more in the process.  These fisheries are even fishier than they smell.

A new study released this week called Wasted Catch: Unsolved Bycatch Problems in U.S. Fisheries reveals the nine dirtiest fisheries in the United States. It’s a dirty bunch indeed, the waste between them accounting for nearly half a billion wasted seafood meals in the U.S. alone.

Culled by Oceana, the largest international organization for ocean conservation, the fisheries are ranked based on bycatch—the amount of unwanted creatures caught while commercial fishing. Combined, they’re responsible for 50 percent of reported bycatch nationwide.

Cleanup efforts have begun after a barge carrying nearly a million gallons of thick, sticky oil collided with a ship in Galveston Bay.

Coast Guard Petty Officer Andy Kendrick said Sunday morning that skimmers are recovering the oil that spilled in Saturday's collision and a boom is in place to protect environmentally sensitive areas.

Kendrick said the remaining oil is being moved off of the damaged barge.

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There’s not much dispute these days, up and down the coast, about whether the ocean is rising. The question is: How high will it go here, and how fast?

North Carolinians must wait until 2016 for an official answer. That’s the law.

After promoters of coastal development attacked a science panel’s prediction that the sea would rise 39 inches higher in North Carolina by the end of this century, the General Assembly passed a law in 2012 to put a four-year moratorium on any state rules, plans or policies based on expected changes in the sea level. The law sets guidelines under which the Coastal Resources Commission, a development policy board for the 20 coastal counties, will formulate a new sea-level prediction to serve as the official basis for state planners and regulators.

Was the 4.4-magnitude earthquake that rattled Los Angeles on Monday morning caused by fracking methods? It's hard to say, but what's clear from the above map, made by Kyle Ferrar of the FracTracker Alliance, is that the quake's epicenter was just eight miles from a disposal well where oil and gas wastewater is being injected underground at high pressure.

Don Drysdale, spokesman for the state agency that oversees California Geological Survey, told me that state seismologists don't think that the injection well was close enough to make a difference (and the agency has also raised the possibility that Monday's quake could have been a foreshock for a larger one). But environmental groups aren't so sure.