A possible concise summary is:
The speaker talks about the environmental problems that the world will face in 2050 according to a UN report. He mentions the greenhouse effect, the melting of the poles, the rise of sea level, the increase of storms and hurricanes, the decrease of food production, the pollution of air and water, the loss of tropical forests, the overfishing of edible fish, the emergence of super bacteria resistant to antibiotics, and the uncontrolled migrations and overcrowding in cities. He says that the only solution is to change the social paradigm and live with less instead of more, but he doubts that this will happen. He asks for support to become the world president and ends with a pessimistic note.
Here are some key facts extracted from the text. I have numbered them and kept them short sentences.
1. The UN has made a report that details how the world will be in 2050 and the environmental problems that will arise.
2. The greenhouse effect is increasing due to the intensive use of fossil fuels and deforestation, causing the world temperature to rise.
3. The melting of the poles will cause a rise in sea level, destroying many towns and coasts and reducing habitable space.
4. There will be more storms and hurricanes due to the extra water vapor in the atmosphere, as well as more evaporation of potable water sources.
5. Food production will decrease by 2 to 5 percent due to the increase in temperature, leading to more famine and possible wars.
6. Environmental pollution will cause between 7 and 10 million deaths annually by 2050, mainly due to the haze in big cities.
7. Almost all fish populations could become extinct by 2050 due to indiscriminate fishing, causing more famine and loss of medicinal ingredients.
8. Between 50 and 70 percent of the tropical forests will not exist by 2050 due to deforestation, causing less regeneration of the atmosphere and loss of medicinal ingredients.
9. Super bacteria resistant to antibiotics will cause millions of deaths annually and become the number one reason for death on the planet by 2050, due to incorrect use of antibiotics.
10. Uncontrolled migrations due to famine, wars, etc. and an increasing concentration of human beings in cities will cause more transmission of diseases and more energy demand.