At 03:20 PM 1/18/2012, Hugh wrote:
>People are one part of nature and the ecosystem a tiny and insignificant part.
>Here's something to help visualise that:
>
><https://youtu.be/Y...­

This video indicates 15 parts per million as from human sources but
it does not distinguish between additions to the atmosphere and 
accumulation of gases.
15 parts per million per year over 100 years means 1500 parts per million.
The question is how quickly is our contribution removed from the atmosphere.
This is not addressed in the video.
The video is tolerant of a gradual accumulation of CO2 by not 
addressing the issue.
It also does not address the change in atmospheric properties induced 
by small changes in the mix of its gases.
If you have an article on this subject which calibrates its findings 
with standard observations of atmospheric properties, that would be useful.
Something with a good supporting bibliography would be useful.

The main impact of humans is to reduce the ability of the biosystem 
to remove CO2 from the atmosphere through deforestation, agriculture, 
and extirpation of the whales.

>Just because we are insignificant and nonconsequential compared to the Sun
>doesn't mean we should go around acting like jerks though.
>
>We should be stewarding nature and helping along the 'next' whales
>by doing our best to accellerate climate change and thus 
>accellerating evolution.

The main accellerants to evolution have been mass extinctions.
I am not sure if we have general public support to support mass 
extinction to accelerate evolution.

>On Wednesday 18/01/2012 at 2:43 pm, Stan Racansky wrote:
>>Hello Hugh,
>>
>>Very good evolutionary point but we are also talking how much our 
>>friendly neighborhood homo sapiens are helping the process. The 
>>nature is one thing, human stupidly other.
>>Stan