It was teeming with life, most of it much bigger and more impressive than what we have now, from what we can deduce from the fossil record.
Again, look at the chart showing the temperature profile for the past 500m years. I'm not burying my head in the sand at all. The climate is definitely changing and warming. There's a difference between climate change denial, and actually looking at the data and seeing that both the rate of change (rapid) and the actual temperature (still pretty cold) aren't anywhere near the apocalyptic levels it's presented as.
Yes desert zones are extending, and glaciers are retreating. But this isn't unusual. That's my point. The Earth hasn't always been how it is now, although we can't seem to get our head around that and have this weird need to try and preserve it, whilst simultaneously ripping every resource possible out of it and colonising every usable inch of it.
Earth having ice caps at both poles simultaneously isn't the usual state of things. There shouldn't be glaciers near the equator. Now, given that as a species we have evolved into a rather cold climate and then spread from our equitorial home range and absolutely exploded in numbers, then this is a bit of a problem for us. But for the planet it's fine, really no issue and nothing out of the ordinary. Habitat loss, intensive agriculture, overfishing, deforestation, all of these things need urgent attention. But for some reason people are fixated on the climate, the one thing that's in a constant state of flux anyway.
None of this means we can keep burning fossil fuels as we do now either. That's clearly unsustainable and something we need to move away from rapidly. Again, I'm not a climate change denier, I just don't see that for the planet as a whole it's much of a problem, given how warm it's been in the past. It'll just be different, and us, along with every other species need to evolve and adapt or die out. For those species that can't adapt, others will evolve to take their place.
You say extreme weather is getting more frequent, but compared to when? 1880 onwards? That's nothing. We have no idea what the weather was like 3,000, or 10,000, or 50,000 years ago. It's only extreme compared to the 0.00034% of Earth's history we use as our baseline. The other 99.99976% of time is discounted for some reason when all of these sweeping pronouncements about how screwed we are are made.
Edit: Is extreme weather getting more frequent? Again, for one type of extreme weather, that isn't what the data shows. Quite the opposite. A rather inconvenient truth...
Climate change has driven a 13% decline in the frequency of tropical cyclones since pre-industrial...
www.carbonbrief.org