They're just as much "Theorists" as he is, because no matter how much these guys observe, study and play with models, they can not predict the future any more than anybody else..... they can only "Theorize" over what may or may not happen in the future based on their observations.
Nonsense, they're not theorizing about things as difficult to define let alone prove as the Gaia
hypothesis, they're out there measuring changes in the cryosphere, ocean temperature, circulation, salinity, expansion and large scale oscilations. They're monitoring increases in atmospheric greenhouse gases that are almost certainly the result of human activities like burning billions of tons of fossil fuels a year and land changes like deforestation and urbanization. They produce models based on well established physical principles and check their accuracy by inputting past conditions and see how well they reproduce events we know with high degrees of confidence already occured. This dark age of science you seem to believe in is a myth, science is a very powerful tool, the way we're communicating now would have appeared as magic not too many decades ago.
So you Theorize.... you can't state without a fact that any of the above is true.
Science builds on its past successes, it doesn't start from scratch, the science of climate change is built on a solid foundation of Physics, geology, climatology, biology, chemistry, etc... it's about as real as you get in this world.
If the planet can sprout life after being a lifeless rock spewing nothing by lava.... if the planet can survive getting smacked by an asteroid and bounce back, if the planet can survive a global Ice Age and bounce back.... if the Glacier Ice Core samples show that there have been many stages in the Earth's life where CO2 and global temperatures were just as high as today (and at some stages, higher than today) & bounce back down, and up again, and down again, etc.... long before humans came along or even hit the industrial revolution...... all of this puts massive doubts on your claims on just how fragile and weak our planet is.
for the vast bulk of the history of the planet most life has been primitive single celled organisms, modern multi-cellular life is a recent arrival and at times very vulnerable to severe changes in planetary conditions. In the Permian extinction almost all species of complex organisms went extinct, about 95%, it took almost 100 million years for the biosphere to recover to the same level of genetic diveristy. In the K-T boundary event about 75% of life went extinct and it took about 10 million years for a full recovery. Life is resiliant, not invulnerable, and your logic is a poor excuse for us driving another major extinction event that would most likely include us. The K-T boundary event is a stark warning about the dangers of climate change, as it was a rapid cooling then a rapid warming as a result of all the CO2 blasted into the atmosphere as the comet/asteroid plowed into the limestone seabed.
Yes, we have an affect on the environment around us..... to a degree, but no where near the level of affect as some people would make us think.... otherwise if they were right & global warming was true and accurate with their findings, people in Halifax & Vancouver would be getting around by boat by now & PEI would be a mere sandbar..... more so.
We are the main driver in global environmental change now, we emit far more new greenhouse gases into the atmosphere than natural geological processes. Quantum Electrodynamics ensures that will have profound effects on the overall radiative balance of the atmosphere requiring significant climate change in response. It's not something that theorists are manufacturing, the theory of human generated climate change is solidly rooted in the most fundamental science available to us, it's only controversy is a product of creative minds doing PR for the fossil fuel sector.
Last I heard, we were supposed to have a completely ice free north pole a couple of years back..... hasn't happened yet.
Who were you talking to your hair stylist?
2007 was the first time in recorded history that the Arctic ocean was circumnavigable due to the declining ice pack. It has thinned by almost half in recent years and the extent of the much thicker and stable multi-years ice significantly reduced. Depending on local climatic conditions the already reduced Arctic ice pact could undergo a severe decline producing an ice free Arctic ocean probably within this decade.