We're here because an ancestor species crawled out onto land, not because humans did. We do have tails - vestigial tails, because at one time our distant ancestors did hang from branches. Our brain volume has been decreasing for several tens of thousands of years, allegedly because our brains are rewiring themselves more efficiently, in a smaller space. People today are no more intelligent than people of the middle ages, Roman times or earlier. We have technology now that might give the illusion we're smarter than we were. Dissemination of knowledge and the retention of it over long periods of time is down to the invention of the printing press. We are the most technologically advanced species on the planet, but that's only one facet of a species. Maybe the whales and dolphins are more advanced than we are in other respects.
Human lifespan has been extended somewhat by medical technology, especially where disease would otherwise kill people. Lifespan has been extended more by better nutrition, better availability of food and better living conditions.
Actually, our chances of long term survival are much lower than other species. We have the capability of wiping ourselves out in numerous ways that no other species has. We also have the capability of wiping out many other species too. We're actually in the middle of an Extinction event right now, driven by human activity and its effect on the environment. The average lifespan of a species is 100,000 years. We used to think modern humans moved out of Africa 100,000-200,00 years ago but recent discoveries have pushed the age of our race back to 300,000 years. That we haven't gone extinct yet is counter to natural law. Intelligence is a trait whose value as a survival mechanism is still being tested. It does seem to be a good survival trait but it has a collateral cost on the rest of nature. If we wipe out the planet, then intelligence will have been the worst survival trait that ever evolved.
We dropped the ball on space travel back in the 1970s when human spaceflight was relegated to driving a faulty truck into space (the Space Shuttle). No human has been beyond low-Earth orbit in 45 years. China has the best chance of putting a man on the Moon and on Mars in the next couple of decades. Human colonization is decades away unless some radical choices are made. And the effects of climate change or a limited nuclear war may be felt before any colonization efforts see fruition.
We're in agreement that this planet will become inhospitable at some point. However, that point is sometime in the next 30-80 years. Near enough that many alive today will be around to see it (if not for long!)
RE: Humans Are Not Smarter Than Other Forms Of Life, Just Different