Now that's a clever one. It's true in that the energy being dumped on the planet every day by the sun is huge compared to what we burn, so at first glance people will think it's a decisive argument. It's easily understood, so people with little understanding of the situation can think they've seen right through all the conspiracy etc. I'll add that one; if you can make your audience feel clever doing it, they'll believe anything you want.
Hence the common refrain in a lot of the denialist screeds of, "This is just common sense", "we already know this", "it's simple science", "THINK, PEOPLE!!!!', etc.