I'm not even speaking to Co2.
I'm merely speaking to this "local" as you say, effect we generate. It's all local. Everything is. It all has an effect on the whole. Again, the water example is a good one. A single well, a "local" effect as you put it, can be easily dismissed as having no significant effect. But after we have drilled millions of wells, these vast, almost incomprehensible aquifers are disappearing. The water table is sinking. 100 years ago it was 25 feet. Then 60. Now it takes a 200' well to reach the water.
The idea that man's small impacts are only "local" and not an affect on the whole is a terrible flaw of logic. It's not "lost in the backgorund noise", you simple chose to not see it, for the back ground noise. It's still there.
Wrong again. I see mans damage every day. My whole life has been devoted to the repair of that damage. I am now retired but for over 35 years that was my goal.
The water tables are sinking due to misues of water plain and simple. Golf courses should not be planted in a desert. Phoenix AZ should not have the population it is attempting to support in a desert. It is simply foolish to do that sort of thing and the environmental damage is great IN THOSE AREAS.
However, you all like to play numbers games till you are actually presented with those numbers and they don't support you. Environmentalists have been actively engaged in programs that do far more damage to the environment than the problems they are supposedly trying to solve. I'll use your water example as a case in point. The California Air Resources Board mandated that MTBE be used as an oxygenate in gasoline to clean the air. It did that job well, however they ignored significant warnings as to MTBE's known carcinogenic problems, its caustic nature and of course its known poisonous qualities.
After 10 years that regularly saw cars bursting into flames (nearly every day) as their fuel systems were destroyed by the MTBE, and the constant illnesses caused by it to sensitive people, they were finally forced to remove it after it was found to have poisoned the water wells throughout the state. Thousands of wells are no longer usable becaue of environmentalists refusal to listen to scientific fact.
I can go on and on about how environmentalists are causing more damage than the problems they are supposedly trying to fix but i doubt you would pay attention to that. You clearly have a fixed mind set. I do however suggest that you read other sources of material and hopefully you will come to the realisation that the environmentalist organizations (not individual people, just the parent organizations) really don't care about the environment. They care about power and how to concentrate it in the hands of those they like.