[cogitator]

I simply don't believe that humans have the capacity to create the extreme climate changes that the earth has experienced in the past.

Don't forget time-scale. Some of those extreme changes happened over thousands of years. (They look quick when the plot is millions of years long.)

I'm not even convinced we have the ability to make even small changes in the overall climate.

Do you think stratospheric ozone depletion is natural? Ozone depletion is about 50% of the reason that the stratosphere is cooling; the other 50% is caused by reduction of radiative warming due to increased tropospheric GHGs.

[SuziQ]

Those who report about the ozone layer seem to concentrate on Antarctica, without ever mentioning that Mt. Erebus, a volcano on that continent, is spewing ozone depleting materials into the atmosphere on a continual basis.

Frankly, I'd be interested to find out if the cosmic rays, the absence or presence of which seem to be a major force in the warming and cooling of the planet, are also having an effect on the production of ozone in our atmosphere.