5 . Pollution

Pollution happens when the environment is dirtied, by waste, chemicals, and other harmful substances(物质).Pollution is a problem all over the world. But it is especially bad in large cities with a lot of industries and cars.    1    

Wildfires, volcanoes, and industrial chemicals cause some air pollution. But most air pollution comes from burning fossil fuels (矿物燃料）These include coal, oil and natural gas. The burning of fossil fuels may release harmful gases. Air pollution may cause such diseases cancer and asthma. It also leads to polluted rain that can harm living things    2     Finally, air pollution damages the ozone layer(臭氧层)which is important because it protects Earth against harmful rays from the sun.

Causes of water pollution are easy to see. People dump(倾倒) garbage and dirty water into river, lakes and oceans. Factories or cities sometimes release poisonous chemicals, and other wastes into water. These chemicals may make the groundwater unfit to drink.    3    

Littering, or throwing garbage on the ground, is a form of land pollution. Litter can destroy the habitats of plants and animals. The buildup of dangerous chemicals in the ground is another form of land pollution. The chemicals may come from farms or factories.    4     They may even harm people who eat the polluted plants and animals.

Many governments, environmental groups, and ordinary people are working to control pollution. Governments have passed laws to keep people from releasing dangerous chemicals into the environment     5     Instead they are getting power from the sun, wind, water, and other energy sources to produce less pollution. Many communities use recycling to reduce pollution.

6 . Space is where our future is — trips to the Moon, Mars and beyond. Most people would think that apart from comets (彗星) and stars, there is little else out there.     1     Scientists are now concerned that if we don’t clean it up, we may all be in great danger.

The first piece of space junk was created in the year of 1964, when the American satellite Vanguard I stopped operating.     2     However, since it kept orbiting around the Earth without any results, scientists became increasingly comfortable abandoning things that no longer served any useful purpose in space.

    3     The junk varies from tiny pieces of paint chipped off rockets to cameras, huge fuel tanks, and even odd items like the million-dollar tool kit that astronaut Heidemarie Stefanyshyn Piper lost during a spacewalk.

The major problem with the space trash is that it may hit working satellites and damage travelling spaceship. In addition to this, many pieces of junk may crash with each other and break into pieces which fall back to the Earth.     4     Ground stations have been built to monitor larger pieces of space trash to prevent them from crashing into working satellites or space shuttles.     5     They will stop littering in space and to clean up the trash already there.

7 . Some of the greatest problems we face today are concerned with the gradual destruction of our environment. Brown clouds; wildlife ____; polluted water. These ____ all seem so huge. So my family does what we can. We take cloth bags to stores instead of using plastic bags. We walk where we don’t have to ____.

But does it do any good?

I recently learned something about flamingos (火烈鸟). These beautiful birds gather in     ___ groups of a thousand or more. Every year, when the time ____ for migration, a few flamingos start the process by taking off from the lake. But ____ of the others seem to notice, so the tiny group returns.

However, the next day they ____ again. This time a few more struggle along with them, but the vast majority still ____ no attention, so these pioneers come back.

The ____ continues for several more days. Every time a few more birds join in but, _____ the thousands of others still take no ____, the great migration plan is once again ____.

Then one day something ____. The same small group of birds takes wing and a tiny number more join in, just as before. And this time their total number, though still quite ____, is enough to tip the balance. As one, the whole group takes flight and the migration ____. What a ____ sight it must be – thousands of flamingos taking to the sky at once!

A few can make a ____. It’s true that all of the great problems of the world have been solved because of the ____ efforts of a few.

If you believe in a cause (事业), don’t ____! Others will someday take notice and together we will ____ even our greatest problems.

8 . Green Consumer Day is observed worldwide every year on September 28. The_______is to purchase only eco-friendly products as a way to________the impact consumerism has on the environment.

But we should NOT consume products even on Green Consumer Day.

Creating any product_______the use of energy; let's not_________climate change. For the most part, that energy is going to come from fossil fuels-coal, oil and natural gas._______coal or drilling for oil and natural gas creates environmental nightmares, while burning fossil fuels is the biggest_______of climate change. Unless a product is made using 100 percent_______energy, it will have a carbon footprint. We all know how_______the planet is heating up, so our goal should be to shrink our footprints, rather than expand them．

Manufacturing_______uses a lot of water. No matter how______a product is, water will be needed to clean the materials and clean it again_________the product is made. Many parts of the world are suffering from________ We can help conserve our precious water resources by buying fewer products, even if they're_____

Most products will still_________in trash. We don't need more solid waste! Even if the eco-product we buy is not disposable, the packaging it comes in will get thrown away.

Why go shopping when you could be out_________nature? Shopping can be a pretty stressful way to spend an hour or two. Wouldn't you rather take a walk, have a picnic or otherwise have fun with friends and family?

Buying more stuff adds to our_______and doesn't make us any happier. Most of us_______to have even more things than we can use. Adding to the load just increases the________of the mess we need to address. Plus most people________that spending time with family and friends makes them much happier than acquiring_________, even if it's green.

10 . If you really want to go green, here’s good news: eating green foods is good for you. The very foods with a high carbon dioxide cost — dairy products, processed snacks — also tend to be filled with fat and calories. A green diet would be mostly vegetables and fruits, wholegrains, fish and lean meats like chicken — a diet that’s eco- and waistline-friendly. Eating green foods can be healthier and beneficial to the climate.

It may be hard to believe that a meal at McDonalds produces more carbon dioxide than that your trip to a faraway place produces. More than 37% of the world’s land is used for agriculture, much of which was once forested. Deforestation (砍伐森林) is a major source of carbon dioxide. The fertilizer (肥料) and machinery needed on a modern farm also have a large carbon footprint, as does the network of ships and trucks that brings the food from the farm to your plate.

The most efficient way to reduce the carbon footprint of your menu is to eat less meat, especially beef. Raising cattle takes a lot more energy than growing the equivalent (相等的) amount of grains, fruits or vegetables. What’s more, the majority of cattle in the U.S. are fed on grains and the fertilizer used to grow grains creates separate environmental problems.

Focus on eating food lower on the food chain, with more plants and fruits and less meat and fewer dairy products. It’s simple. We can change today what goes into our bodies for the health of our planet and ourselves.