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By Seth Borenstein The Associated Press

Science Says: That Michigan meteor could have been meatier

WASHINGTON — The fireball that streaked through the Michigan sky put on quite a show but as far as potentially killer space rocks, it was merely a flash in the pan.

There are much bigger asteroids careening through our solar system. Scientists who watch for them hope they spot them in time to get people out of the way if a truly dangerous one is heading straight to Earth.

Low oxygen levels, coral bleaching getting worse in oceans

WASHINGTON — Global warming is making the world’s oceans sicker, depleting them of oxygen and harming delicate coral reefs more often, two studies show.

The lower oxygen levels are making marine life far more vulnerable, the researchers said. Oxygen is crucial for nearly all life in the oceans, except for a few microbes.

Warming to make thunderstorms larger and more frequent

WASHINGTON — Summer thunderstorms in North America will likely be larger, wetter and more frequent in a warmer world, dumping 80 per cent more rain in some areas and worsening flooding, a new study says.

Future storms will also be wilder, soaking entire cities and huge portions of states, according to a federally-funded study released Monday in the journal Nature Climate Change.

Global carbon pollution rises after 3 straight flat years

WASHINGTON — Scientists say global carbon pollution went up this year after three straight years when it didn’t go up at all.

Preliminary figures project that worldwide carbon dioxide emissions rose about 2 per cent. The heat-trapping gas is a key cause of global warming.

The report out Monday dashes hopes that emissions from the burning of coal, oil and gas had peaked.

Earth’s ozone hole shrivels to smallest since 1988

WASHINGTON — The ozone hole over Antarctica shrank to its smallest peak since 1988, NASA said Thursday.

The huge hole in Earth’s protective ozone layer reached its maximum this year in September, and this year NASA said it was 7.6 million square miles wide (19.6 million square kilometres). The hole size shrinks after mid-September.

Scientists witness huge cosmic crash, find origins of gold

WASHINGTON — It was a faint signal, but it told of one of the most violent acts in the universe, and it would soon reveal secrets of the cosmos, including how gold was created.

Astronomers around the world reacted to the signal quickly, focusing telescopes located on every continent and even in orbit to a distant spot in the sky.