The unthinkable is that we're distorting this atmospheric balance. We're shifting the chemical balance so that we have more poisons in the atmosphere - ozones and acid rain on ground level - while we're also changing the thermal climate of the earth through the greenhouse effect and - get this - simultaneously causing destruction of our primary filter of ultraviolet light. It's incredible. Talk about the national-debt crisis - we're piling up debts in the atmosphere, and the piper will want to be paid.