Jon -
No, it is NOT natural, and you can confirm this from basically any scientific source you like.
The climate changes only when something makes it change - be that massive global volcanic acitiity, solar acitivity or, as we see now, human activity. But it does not change of its own accord.
In all seriousness, man, do a bit of reading from any decent, objective source and I'm sure it will statto make sense.
This is just something to get you started...
A common skeptic argument is that climate has changed naturally in the past, long before SUVs and coal-fired power plants, so humans can't be the cause of the current global warming. Peer-reviewed research shows this is not the case.
It's important to know there are a number of different forces acting on the Earths climate. When the sun gets brighter, the planet receives more energy and warms. When volcanoes erupt, they emit particles into the atmosphere which reflect sunlight, and the planet cools. When there are more greenhouse gases in the atmosphere, the planet warms. It's worth remembering that without some greenhouse gas the Earth would be a ball of ice.
What does past climate change tell us about global warming?
Yes, it IS natural. There is far more evidence to support natural variability for everything that is being witnessed than for any of the fraudulent crap you claim....