1. Local effects -e.g. poisoning humans breathing bad air.
2. Regional effects - fallout from airborne pathogens - infections, particles, chemicals.
3. Global effects - changing interactions between the atmosphere and sun, weather effects, effects on plants and oceans.
Developments in the media made "green" the slogan for action to limit the adverse effects of air pollution. The media often suggested that this is a relatively new consensus that there is an environmental crisis. They excused people who have ignored the effect of greenhouse gases on climates over the past 40 years. Some know what is really going on out there, but most people do not know or know but deny the obvious for selfish reasons.
Green refers to the color of chlorophyll in plants. Chlorophyll is the basis of photosynthesis that allows plants to turn the sun's energy into life energy. Human action destroys plants and replaces healthy ecosystems with concrete and asphalt. Another slogan that emerged was "save planet earth." Humans will not save the planet. The task for humans is to stop destroying the environments that sustain us. If we fail, the planet will do just fine without us.