Planetary changes which will have an influence on many are drawing near because of the poor ecological(生态的)state of the planet.Actually change has already begun through climate changes，but most humans haven't noticed this yet.Climate change has begun to influence the world already and will begin to worsen within the next few years.Around 2011 most people will begin to see that the results of climate change will be far more serious than now understood.
As the planet is under big geological(地质的)stresses，which are continuously increasing，it will in the future no longer be able to support its population.Scarcity(缺乏)of resources，over-farming，lack of clean air，not enough clean drinking water and drought are some of the issues that will all play a much greater role in the near future.
Humans have caused large ecological devastation(破坏).The lifestyles of many people are improving at a fast speed;however，this will finally result in a lack of some precious resources.When this scarcity begins to happen，people will no longer be able to have sustainable(可支撑的)lifestyles.
It's important to understand that everyone plays a role in the whole process of life.Each person's decision can finally affect the future.These decisions，all combined，can have a very good effect on what the future will be like for humans.So the future depends on the choices we make at the present moment.
While more and more people are becoming aware(意识到的)of climate change and other environmental problems related to global warming，not all are fully understanding how far-reaching its effects will be.Unfortunately，most of the humans are aware that the planet isn't functioning well，but they don’t understand that this is creating a major problem for the future survival of humans.
So，every person should make the necessary changes to reduce their influence on the environment and help create a more sustainable future.
1.Which is the BEST title for the text?
A.The Causes of Planetary Changes
B.The Influence of Ecological Devastation
C.The Ways of Building a Sustainable Future
D.Environmental Damage and the Human Future
2.It can be known from the first paragraph that ________.
A.planetary changes are caused by global warming
B.climate changes will affect the life of humans soon
C.the ecological state of the earth has been destroyed
D.most people don't realize the danger of climate changes
3.What opinion does the author most probably hold?
A.Humans shouldn't try to improve their lifestyles.
B.The future we'll have depends on every one of us.
C.The ecological devastation is coming to a stop soon.
D.The future of humans can be determined ahead of time.
4.In the last paragraph the author is trying to ________.
A.encourage people to make efforts to protect the environment
B.call on people to work hard to make their future better
C.warn people of the dangers of ecological devastation
D.tell people the right way to protect the environment
5.The author's attitude in writing this text is ________.