Lightning strikes are the second most common (普通) cause of death of all disasters in America. The first is floods.

Because lighting often kills only one or two people at a time. Most of people don't think it was as dangerous as other disasters. The US wants more people to learn about lighting. It makes June 22-28 National Lighting Safety Week. It also provides safety tips during the thunderstorms.

If you hear thunder, you are in danger from lighting,"said Rocky Lopes, a disaster worker. "Thunder means that lightning is close enough to hit you at any minute, so you should move indoors at once and stay there until the storm is over. This is the most important thing to remember, " Lopes said. And he also gives us some advice on safety:

Stop working, fishing, swimming or playing in the open air.

Don't stand under the tree.

Keep down if there is no cover.

Ben could hear strong winds outside his home in Alabama. Black clouds were making the sky very dark. With no light outside, it felt like midnight. The news on TV reported that a heavy rainstorm was in the area.

Everyone in the neighborhood was busy. Ben’s dad was putting pieces of wood over the windows while his mom was making sure the flashlights and radio were working. She also put some candles and matches in the table.

Ben was helping his mom make dinner when the rain began to beat heavily against the windows. After dinner, they tries to play a card game, but it was hard to have fun with a serious storm happening outside.

Ben could not sleep at first. He finally fell asleep when the wind was dying down at around 3:00 a.m. When he woke up, the sun was rising. He went outside with his family and found the neighborhood in a mess. Fallen trees, broken windows and rubbish were everywhere. They joined the neighbors to help clean up the neighborhood together. Although the storm broke many things apart, it brought families and neighbors closer together.

A strong EI Nino（厄尔尼诺暖流）causes the temperature around the world to rise. “That’s how we will see the influences of climate (气候) change", says Michael Mann, a climate scientist at Penn State University.

The Great Barrier Reef (礁) is far beyond its name. Coral (珊瑚) of all shapes, sizes and colors covers more than 130,000 square meters off the coast of Australia, making it the world's largest reef system with many amazing kinds of life under the sea.

But today the Great Barrier Reef is dying. The waters around the reef become warmer. That warming then causes the bleaching(白化).The bleaching takes the color and the life out of the coral. Bleaching happens when the warm water and pollution drive away the living things that live on the coral and give it color. Within weeks, the reef could die, leaving behind a forest of lifeless, bone white coral. Scientists believe the bleaching may kill more than 15% of the world’s coral. The Great Barrier Reef isn't alone. This is the longest bleaching event ever recorded, " says David Kline, a scientist.

But a bigger worry may be what the bleaching suggests about future climate(气候)change. Climate change may be slow sometimes, but other times it takes great leaps forward, "says Steve Palumbi, an ocean scientist at Stanford University.

Local solutions like reducing fishing and cleaning up, pollution can help slow reef loss, but scientists say a global(8)problem requires a global solution. Nearly 200 countries agreed last year to work to keep global temperatures from rising more than 3. 6F by 2100, but that goal will be hard to reach.