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And in 50 years, in a single lifetime, the Earth has been more radically changed than by all previous generations of humanity.

This 50 years have served to see if humans have acted correctly in their lifetime.
Its true that the human evolution has been perfect for new progress like in technology, science, society and politics that has served us to improve. However, now, the lack of oil, violence, important climate change, poverty and bad economy in many countries are the consequences that people must pay to degrade the planet. It’s a time when we can see that people want more and more and they are waiting for new technologies capable of making a like easier using energy without looking at the amount.

The catastrophe of Japan has been a perfect example for people to see that nuclear power plants that we have built ourselves can ‘kill’ us.
However, the most of all is that this bad situation will not improve because we don’t know how to live without things that are now essential, but before weren’t .
To conclude, this sentence makes a lot of sense but we can’t see this or we don’t want to see it.