The ultimate source of energy in this solar system is the Sun
Through the Sun, Photosynthesis is possible
Through Photosynthesis, life on Earth is possible
Glucose is the fuel for all living and once living things on Earth
If we reduce Carbon Dioxide then we will reduce the amount of Photosynthesis that takes place on Earth, thus reducing the available fuel for all living things
When we displace ecosystems, we lower the Biodiversity of all life on Earth, thus making ecosystems and the whole Energy Pyramid less sustainable
Every new neighborhood, parking lot, road, etc... comes at a cost to all living things