It's not only about climate change

The disaster planet earth is facing, and then all of us ontop of it, is not only climate change. Instead it's about several different things. It seems as some people think that this planet have enough resources to feed and give production to every one of the 6,8 billion people in this planet. Sure, we know that is not possible. We just have too many problem to deal with.

Air pollution (smog, sulfur oxides, nitrogen oxides, ground level ozone etc. causes mainly from production and traffic)
Soil erosion (removement of trees and plants, monoculture agriculture, changed waterlevels and directions, change of flow)
Water shortage (soil losses their water-holding characteristics by removement of covering plants, agriculture with intense irrigation, lowering of groundwater level and change waterways i.e cities, industry, cotton production, parks, golf, water games etc)
Nutrients availability in soil decreases (monoculture agriculture, overuse of of fertilizers)

Two questions; Is this something to work with in a global way or is it for local projects? And are the solutions about the physical things, as low-energy, passive buildings, biogas cars, organic cotton, or the way of thinking and doing?

What can we learn if we open up our minds and think more in the ecological way? (i.e in this sentense not meaning buying organic/sustainable goods but instead take a closer look at the meaning of the word ecology; as the study about distribution and abundance of population in interactions with the environment)

For human population or the ecology of humans that would mean; why do we live where we live; what do we need around us in such a place? Can we be their for a longer time? Can the population grow in the specific area? How big is the area? Is it expandable?

Is it even possible to have an society which take those things under consideration? A community based on knowledge in ecology, the ecological city in balance with nature? Do we have to build new cities to manage that? Or can we rebuild houses/neighbourhood's/areas/villages/big cities?? Is it impossible to rebuild whole cities in balance with nature? Small project starts here and there, with small areas with "sustainable" neighbourhood. How can this be enough? Sunpanels on houses, some trees in town and streets without cars. What about the whole spectra, with the whole society and problems to that? What about consumption for instance? What about our ecological footprint? Is it possible do decrease it if we live in such a city? How can we manage to handle the environmental disaster that is close to come?

To argue about climate change is real or not is just a waste of time. We don't have time if it's true, and if it's not, all those small projects now running is a necessity for all the other problem we face.

Last,

Do we need more landarea to expand production (that would be in another planet), do we need more transports (international trade) or do we need (the first real) ecocities that are based on the balance of human and nature, which take care for people and nature and thinks about the consequenses even in the future?