Answer: Since our egoism has reached its complete development in the process of evolution, we are in a crisis with nature that surrounds us. Nature is single and integrated while we are egoists, detached from one another and divided, and so we are opposite from nature.
This leads to a crisis in many aspects of life including the ecology and society. Nature might just omit us out of its system if we don’t reach a state of balance with it. The wisdom of Kabbalah tells us about it in a much simpler way. Love thy friend as thyself is the main law of nature, and it is even simpler to yearn for unity. This is what we explain to people.