"Future generations" are just a tiny tick on the geological timeline. I believe our species will eventually go extinct, and that it's arrogant to think we are different from the animals that preceded us. I just don't think our enlarged craniums are going to be able to solve all of the problems that will face us. It might be an apocalyptic event, or it might happen more slowly. Could be a few centuries, or it could be thousands of years. If something occurs that reduces the human population, like some sort of pandemic or asteroid impact or ice age or whatever, then it might even prevent humans from depleting the Earth's resources. But eventually SOMETHING will kill us off.
I don't disagree that it's useful to do what we can to slow the depletion of Earth's resources. I try to. I even support some degree of activism. I enjoy my life on Earth, and it's nice to think that future generations might enjoy it for a while. But I do not think humankind will last forever, no matter what we do.
---------- Post added January 29th, 2014 at 06:43 PM ----------
And to bring it back on topic, no, my opinions haven't changed since I started diving.
Human DNA studies show that about 75,000 yrs ago, humans were THIS CLOSE to extinction ! (due to the volcanic eruption of Toba ) For the biological health of this planet, it's almost a shame humanity didn't go extinct.
Genetic bottleneck theory
The Toba eruption has been linked to a
genetic bottleneck in human evolution about 50,000 years ago,
[28][29] which may have resulted from a severe reduction in the size of the total human population due to the effects of the eruption on the global climate.
[30]
According to the genetic bottleneck theory, between 50,000 and 100,000 years ago, human populations sharply decreased to 3,000–10,000 surviving individuals.
[31][32] It is supported by genetic evidence suggesting that today's humans are descended from a very small population of between 1,000 to 10,000 breeding pairs that existed about 70,000 years ago.
[33]
Proponents of the genetic bottleneck theory suggest that the Toba eruption resulted in a global ecological disaster, including destruction of vegetation along with severe drought in the tropical rainforest belt and in monsoonal regions. For example, a 10-year volcanic winter triggered by the eruption could have largely destroyed the food sources of humans and caused a severe reduction in population sizes.
[22] Τhese environmental changes may have generated population bottlenecks in many species, including
hominids;
[34] this in turn may have accelerated differentiation from within the smaller human population. Therefore, the genetic differences among modern humans may reflect changes within the last 70,000 years, rather than gradual differentiation over millions of years.
[35]
....as the Sun continues to age, it becomes 10% brighter every 1 billion yrs, so within the next 500 million - 1 billion years, earth will experience a Venus-like runaway greenhouse effect, blowing off the atmosphere, vaporizing the oceans, sterilizing the planet....and as the Sun mutates to the 'red giant' phase, Earth will melt, be swallowed by the Sun, and vaporize like an ice cube tossed into the mouth of a volcano!....PUFF Earth's gone for eternity!
What's spooky is Life on Earth is almost as old as the planet itself, so if you do the math, Earth has already used up 80 - 90 % of the time frame during which it's a habitable place...geogically speaking we're in the 'end times' now.
---------- Post added January 30th, 2014 at 01:45 AM ----------
When one species goes... Another comes along to fill the niche.... Man has a very small time frame to work from... when you tell someone that it's 65,000 light years to the center of the milky way from earth, they look dumb struck... How can you " THINK " you know what we are doing to the planet ? What is normal for the earth ? It's gone from a hell hole of heat and sulfur in the air that would kill all carbon based life to a giant ice ball covered 1000's of feet deep.... Every were we look we find life.... From hot springs to deep sea vents and even under/ in the arctic ice ...
We just happen to be the major player right now.... Our time will come to give up that spot.... And we have " NOTHING " to say about it...
Jim...
...the 'life' found in extreme environments is usually 'tough pond scum'...nothing terribly exciting, all single celled organisms. For something like 80 - 90 % of the history of life on Earth, nothing more advanced or interesting than 'pond scum' has existed. Given Earth's initial conditions, it's probable single celled life was inevitable and could be taken for granted as almost guaranteed to develop. However, it took BILLIONS of years of evolution to 'break out' to even the simplist multicellular life forms, and had our sun been just a little more massive, it would have evolved into it's Red Giant phase already, meaning the odds are good life on many life-bearing planets is exterminated before it progresses beyond the 'pond scum' stage, ..........mute witnesses to Armageddon ! ....so I'd really like to NOT take glorious creations like Whale Sharks for granted !!!