It is well     1    (know) that global warming results from human burning fossil fuels like coal, natural gas and oil to produce energy. Some by-products of this process are called “greenhouse” gases,    2     which the most important one is carbon dioxide. These “greenhouse” gases can keep     3     earth warm enough for us to live on. However, when     4    (quantity) of extra carbon dioxide are put into the atmosphere, the global temperature tends     5     (go) up.

Although scientists have different opinions about the future effects of global     6    (warm), most believe that the temperature of the earth would increase by about 5 degrees over the next 100 years,    7     may cause the sea level to rise, bring about floods, storms, droughts, the spread of diseases and the disappearance of   species.    8     Hambley says more carbon dioxide will make plants grow     9     (quick)；crops will produce more and that it will encourage a greater range of animals.

Greenhouse gases continue to build up in the atmosphere. The climate     10    (keep) on warming for decades or centuries even if we start reducing the amount of greenhouse gases. What will be the future results of global warming? We wait and see.

While bottled water is convenient, it is also really bad for the environment. Not only does it create rubbish, but it also uses more resources because it     1     (ship) to the shore. To be more eco-friendly, make it a habit     2     (carry) a reusable water bottle with you everywhere so that you can drink water on the go. Plastic bottles are usually the     3     (light) and most convenient. You can also find glass water bottles that are a great choice if don’t like using plastic.