Is global warming and climate change is a myth?

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Do you think global warming is a myth or is there some truth to all the speculations. What i don't understand is that the "experts" say CO2(man-made) is causing global warming. Independent researchers have done a study on the earths warming and cooling. They gathered data from the 1800 up to today and they found that the earth was in a warmer cycle before man-made co2 was released into the atmosphere.The earth is actualy moving into a colder cycle now.The other thing that boggles my mind is that co2 are used by plants to breath and they again release oxygen, so i don't know maybe i am to stupid to understand but isn't that good then for us?