In many books, the human's history are divided into two era, before and after industry revolution. Before industry revolution people used to depend on agriculture, and this is very eco-friendly. Since industry revolution, however, people's activity have ruined nature fast. According to this sharp change, the Earth has been contaminated at serious level and its ecosystem also has been destroyed. For these reason, I disagree the idea that human activities have enhanced and improved the Earth.
Above all, people makes various types of pollutions. After industry revolution, people has considerd that development is the most important thing. Because of this wrong concept, they have cut down a lot of trees, mined natural resources and used fossil fuels in considrable rate. According to this the Earth is contaminated at serious state. Green house effect is the most famous example of this. Carbone dioxide which is generated by fossil fuels makes a layer in atmosphere, and they prevent reflected heat from being released into the Universe. Becaue of this, the Earth's temperature is rising making many serious problems such as melting of the Arctic and rising of sea levels.
On top of that, human activities also have been destroyed ecosystem. Because people need more resources and space, they have invaded nature territory, and many wild animals lost their hebitats. Moreover, this usually make some animals exterminated in the Earth. For example, every year the Amazone has lost huge area of forest because of people's unconcious logging. Due to this, many wild animal such as monkeys, snakes, giraffs have lost their home. And the worth fact is that extermination of animals bring about more serious problem. Since nature has a their own food chain, one spiecy's extermination could effect whole ecosystem.
In conclusion, human's activites have ruined the Earth seriously because they have made many pollutions and destroyed ecosystem. But, today, many countries recognize these problems, and they take actions to make up their mistakes. I hope that this actions will be maintained untill the Earth is recovered.
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