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the causes
Most of the issues that Earth, its environments, and humanity face are caused, exacerbated, or made unsolvable by one or more of these closely interrelated causes:
The size of Earth's human population is causing or exacerbating many of the issues that the Earth, its environments, and humanity face, none of which will be easier to resolve with even more people, and all would be easier to resolve with less.
Most of the issues that Earth, its environments, and humanity face are connected to our use of the resources that the Earth provides for us. The amount of resources that the Earth can provide for us and the rate at which we can use them in our economic activities is limited. If we use resources at a rate which is beyond that which can be sustained our society and ourselves will not be sustained.
Most of the issues that Earth, its environments, and humanity face are connected to the activity of our economies. As our economy grows, so our problems grow with it.