DOUG wrote:The documentary I watched said when can do as much as we like but a bush wires ad volcanos do more damage than humans have done all together an they are all natural occurances how does that work ?? There have been fires and volcanoes long before we started Interfering with the atmosphere or ozone layer or "climatechange " or whatever you wanna call it !! I say it's just one big cycle !!
All these massive canyons that they are finding fish fossils in hundreds of kilometers from water they obviously where under water once upon a time ??
So are you saying then that one documentary (which you haven't referenced so may have been produced by Gina Rinehart for all we know!) outweighs the view of every scientific body on this planet?
Let's look firstly at volcanoes. From my understanding they actually have a cooling affect on the planet. They erupt thousands of tonnes of ash and suphuric acid, which block/reflect a portion of the light away. The affect diminishes over time as the dust settles, so after a number of years we're back to normal.
Bushfires too will release a lot of carbon dioxide into the atmosphere. But again, as the forest regenerates, it will re-absorb that carbon dioxide. After a number of years, as the forest matures, we're back to square one.
On the other hand, with digging up fossil fuels and burning them, the carbon dioxide is released into the atmosphere and
stays there. Same too if the forests are burnt and then turned into farmland. Thus these two activities result in a net increase of CO2 in the atmosphere. As a result of this, carbon dioxide concentrations have been steadily increasing for the past 200 years or so, just google carbon dioxide concentration and you'll see what I mean. The more carbon dioxide in the atmosphere, the hotter the planet becomes. The link between CO2 and heat has been known for a very long time, well over a hundred years. Its all very logical if you think about it, certainly not a scam.
On long time scales, things have changed. Australia, for example, was part of a great supercontinent connected with antarctica and others. Sea levels have changed, but so have land levels. Everest gets higher by a cm a year I think. I believe the current theory is that the dinosaurs were killed off when a meteorite hit the earth, sending massive amounts of dust into the atmosphere and sending the planet into a long winter. But just because there have been long term cycles, it does not change the fact that we can have a massive impact on the climate in a short space of time. Would you choose to trust a single doco produced by ??? or the conclusion of eminent scientists who clearly state that humans are responsible?
BTW ozone layer depletion and climate change are even more separate than weather and climate.