Global Warming is really two issues: 1) Is the Earth warming? 2) Does Human activity play a role?
Anyone even remoely familiar with Earth's geological history knows that the Earth is only just coming out of the last Ice Age and is heading for a 100 million year long inter-glacial period where temperatures are higher than what we've been used to. That is inevitable.
To blame warming on Human activity is merely a political opportunity. As the temperatures continue to (naturally) warm, the politicians will continue to blame Human activity and insist that we need even more controls and regulations. Since the environment touches everything, everything is fair-game for government control as long as the people can be fooled into beliving that Human activity is the cause.
Our real goal should be, not to simply dispute Global Warming, since we know it is a part of Earth's natural cycle. Instead, we should be clearly demonstrating to people the naturalness of warming, and the futility of Human activity to affect it.
That is the only way we can win.