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Wait, you think Putin has credibility when speaking on climate change? To quote the late Sen. John McCain describing Russia as “a gas station masquerading as a country”. Putin's life and livelihood depend on continued world's unchecked consumption of fossil fuels. Putin has zero credibility on the subject. Why would anyone consider him an objective source?

While the public saw Greta behaving like a petulant child during the speech

You and I must have seen different speeches. Part of Thunberg's appeal was her eloquence in speech especially speaking truth to power. Here's part of 16 year old Greta Thunberg's speech in the UN:

"The popular idea of cutting our emissions in half in 10 years only gives us a 50% chance of staying below 1.5 degrees [Celsius], and the risk of setting off irreversible chain reactions beyond human control.

"Fifty percent may be acceptable to you. But those numbers do not include tipping points, most feedback loops, additional warming hidden by toxic air pollution or the aspects of equity and climate justice. They also rely on my generation sucking hundreds of billions of tons of your CO2 out of the air with technologies that barely exist.

"So a 50% risk is simply not acceptable to us — we who have to live with the consequences."

source

I can't imagine a world where you're calling that "petulant". At 16 years old she had more poise and gravitas than many of the world leaders she was speaking to. You say she hasn't done anything. I beg to differ. Further, if what she has done is nothing, it raises the obvious question: what have you done to avert climate catastrophe?