Agreed with regards to the scale, but without the ecosystem the planet is basically dead, like any other planet we know of.

I said our ecosystem, not the ecosystem. It's very unlikely that we are able to cause a runaway greenhouse effect on Earth like what happened on Venus and there's no evidence that this is happening anyway (as we'd be unlikely to be able to stop it; we have about 2 billion years to figure that out). So we'll wipe ourselves out and a good chunk of life on Earth today, but we won't kill the planet.