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I am certain that humans have contributed to a drastic increase in certain volatile atmospheric gases, not too mention the massive pollution of the planet's water supply. There have been trends that tend to show a general increase in worldwide average temperature corresponding with the beginning of the Industrial Revolution until now.
Unfortunately that is far from enough evidence to say that humans have singlehandedly caused the temperature increase. There was mini ice age that lasted until about the beginning of industry which could mean we are in a natural warming period.
There are numerous other natural variables to consider that may result in a global warming:
Orbital variations, solar variations, interstellar variations, internal geophysical variation, natural ocean temperature variations, etc.
I believe humans have had, at the least, a slight impact due to the temperature/industry chronology. I fail to see any proof that we are the sole cause. In fact, I doubt it can be proven. We can't even predict the weather 3 days in advance and we expect to understand the atmospheric and temperature history over billions of years? That is why I believe scientists are tending not to support the theory of man-made global warming. Scientists need physical proof and it will be hard to come by.
By the way, I fully support cleaner energy and better environmental practices. Even if we somehow prove that humans do not play a major factor in global warming, we should still be environmentally friendly. Humans have destroyed most of the planets natural habitats and we continue to push species to the brink of extinction. There are many effects human industry has had on nature that can easily be seen and proven, why not at least address these? By doing so, that would reduce our overall effect on the planet eliminating human contribution to global warming, however small or large that may be.
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