Hi Victoria, this is very good. Because the topic is very complex, there were a few cases where I wasn't 100% certain what you meant. In those cases, I guessed on your meaning and corrected based on that. 

Our Changing World

There are a lot of opinions about what the world will be like in the coming decades and centuries. Today people think that our future is unfolding, and mankind is facing a new stage of evolution. We are already seeing a big change in climate, habitat, and the behavior of animals. Scientists predict more. For example, their predictions about climate: the climate will change much; there will be global warming, and the temperature might rise by up to 4 degrees before the end of the century; the level of water will rise; floods will happen more often; and animals who live in ice will extinct.  

(This list is very complicated and even with the semi-colons <;>, it's not quite right, and I'm not 100% certain which items in the list you want to be a unique idea. Probably better if they were separate sentences.

What about people? Scientists say: it is not a secret that this is the era of computer technology and techniques, therefore scientists talk about comprehensive virtual reality. A person will be able to choose where to live, work, study and even their identity in virtual worlds. The process of eating will change. We will eat energy, wars will be virtual, the life expectancy will rise. People will take for granted that injured or diseased organs can be repaired in much the same way as we fix a car. Robots will do all physical labor. People will create art, and they will do a bit of mental work, there will be cars that go without human effort and more. But these are only words. We can believe them or not. I know the world is changing every minute, and I think some of the predictions will come true.

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Climate and habit are interesting nouns. You use articles and pronouns before them most of the time, when you are talking about a very specific climate or habitat or talking about them in the singular.  "The climate is changing. Our climate is changing. We must save the habitat! The climate of the habitat is humid and hot. Everybody needs a habitat that can support life."  If I am talking about climates or habitats in general, I will not use an article. "The monkeys experienced a change in habitat. Climate is a real concern." Also, the words are often used as adjectives and combined with other words to form a single noun phrase and you won't use articles in this case:  "climate change", "habit destruction"

"Computer technology" is another example of a noun phrase formed with two words, which is why I changed "technologies" to "technology." The two words are used together so often that they have become basically one word separated by a space :)

Our changing world

There are a lot of opinions about what the world will be like through the decades and centuries. Today people think that our future is becoming and mankind is facing a new stage of evolution. We are already seeing a big change in climate, habitat, and behavior of animals. Scientists predict more, for example, their predictions about climate: climate will change much, there will be a global warming, and the temperature might rise by up to 4 degrees before the end of the century, the level of water will rise, floods will happen more often and animals who live in ice will extinct.
What’s about people? Scientists say: it is not a secret that there is the era of computer technologies and technique, therefore scientists say about comprehensive virtual reality, a person will be able to choose where to live, work, study and even their identity in virtual worlds, the process of eating will change, there will be eating of energy, wars will be virtual, the life expectancy will rise, people will take for granted that injured or diseased organs can be repaired in much the same way as we fix a car, the robots will take physical works, people will art, and they will do a bit of mental work, there will appear cars which will go without human efforts and more. But it is only the words. We can believe it or not. I know the world is changing every minute and I think some of predictions will come true.