human activity VS nature

In many respects, human activity is to blame for global warming. Burning of oil and coal are obvious human activities that result in global warming. While nuclear power plants may look better in terms of greenhouse gases compared to burning of fossil fuels, nuclear plants will also directly add extra heat into the atmosphere. In the light of the accelerated greenhouse effect, such extra heat remains - even more than before - trapped in the atmosphere, adding further acceleration to the already accelerating global warming. As said, extra heat may seem insignificant compared to natural heat, but it may just tip the balance when deciding how to allocate subsidies to combat global warming. Similarly, where geothermal schemes extract heat from the depths of Earth, this may also constitute extra heat that wouldn't be added naturally.

Agriculture can also add substantial amounts of extra heat: animals release methane gas, clearing land for agriculture by burning forests releases carbon dioxide, inefficient farming practices result in release of nitrous oxide, etc. In Australia, greenhouse gas emissions from agriculture constituted 16% of total emissions in 2004 (source), while agriculture was largest source of nitrous oxide and methane emissions (source).

But that doesn't mean that all human activity was bad and that all farms needed to be transformed into forest overnight. Bad forestry practies also add extra greenhouse gases, due to composting and formation of swamps resulting in methane, and due to natural burning and firestorms. Many forests would burn naturally and this can be minimised with good forestry management. Similarly, termites release methane gasses, so it makes sense to avoid this.

Banning all human activity and letting nature go rampant is not the answer. The big challenge is to find ways in which we can live, work, travel and do things we want to do while minimising our contributions to further global warming. Capturing the heat of the sun and geysers, and capturing the turbulance of wind, waves and rivers is not only a way to use energy that is already present naturally, it can also flatten wild weather patterns that could do a lot of damage.