OVERPOPULATION IS THE MAIN CAUSE OF OUR PROBLEMS. Climate change, the high cost of housing and food, environmental disasters, traffic jams, clear cut forests, War for oil...

With 8 billion people on Earth our collective actions cause the disasters we are now facing... 

https://www.youtube.com/watch?v=XjWUKFUaoL4

Here's a LINK to "GREENWASHED" a great movie that explains what we need to do and how to do it... We don't have to become extinct! 

One obvious thing we ought to do is to make birth control and abortion free and legal worldwide.

Featuring BBC-presenter and fearless activist, Chris Packham, and created by Mexican physician and environmentalist Sofia Pineda Ochoa, this film confronts existential ecological crises threatening our planet through the lens of a major yet uncomfortable truth — one that most environmental organizations refuse to acknowledge or, worse, actively deny. The film exposes the threat this silence poses for both humans and animals worldwide. We know how to solve our problems and change the world. But the question remains, will we?

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We've known about this since the late 1960s. Ever read the book The Population Bomb?

https://en.wikipedia.org/wiki/The_Population_Bomb 

The Population Bomb is a 1968 book co-authored by former Stanford University professor Paul R. Ehrlich and former Stanford senior researcher in conservation biology Anne H. Ehrlich.[1][2] From the opening page, it predicted worldwide famines due to overpopulation, as well as other major societal upheavals, and advocated immediate action to limit population growth. Fears of a "population explosion" existed in the mid-20th century baby boom years, but the book and its authors brought the idea to an even wider audience.[3][4][5]

Zero population growth: 

https://en.wikipedia.org/wiki/Zero_population_growth

The Zero Population Growth organization, founded by biologist Paul R. Ehrlich, induced a prominent political movement since the 1960s, aiming to reach zero population growth.[2]

The movement considers zero population growth to be an objective towards which countries and the whole world should strive in the interests of accomplishing long-term optimal standards and conditions of living.[3] It faces substantial support as well as criticism, involving different groups of people in society.[2]