I am a climate researcher, and yes: you are right. The Earth is currently warming up and would also do this without human intervention. However, we are contributing to this process by burning fossil fuels on a massive scale. CO2, buried in the ground for millions of years is now being burned and wraps around our planet like a blanket. So, we are speeding up the rising trend in global temperatures. Normally, global temperatures evolve slowly over thousands of years, but now they do in the lifetime of a human.
You don't need to be climate researcher to realise this will put additional pressure on ecosystems that are already under a lot of stress. And changing weather patterns will have an effect on crops, rising sea levels will impact coastal areas, etc... Earth can become quite inhospitable. So again... why take the risk? Earth's a pretty good place to live in space. Why mess it up by playing with the climate control buttons?
And it's not like the solution are so draconian. They simply state we should be more energy efficient, pollute less and switch to more environmental energy sources. Again, why would anybody be against that? Now that we finally have 190 countries agreeing on these principles, the US wants to pull out.
Sad.
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31,000 scientists represent only a very tiny fraction (~0.3%) of all US science graduates. And they are not all climate researchers! According to figures from the US Department of Education Digest of Education Statistics, 10.6 million science graduates have gained qualifications consistent with the polling criteria since the 1970-71 school year. 32,000 out of 10 million is not a very compelling figure, but a tiny minority - approximately 0.3 per cent.
There are also many issues casting doubt on the validity of this petition. On investigation, attempts to undermine the scientific consensus on climate change often appear to have ideological roots, vested business interests or political sponsors. The claims made for this petition do not withstand objective scrutiny, and the assertions made in the petition are not supported by evidence, data or scientific research.
So again, it's simply a propaganda website. You can also easily find a website claiming the Earth is flat. It also has a lot of followers. Why not quote them as well?