When the "knowledge" has more political propaganda than scientific truth in it, that is another matter.
The fear that Al Gore stirs by showing results of 10 foot to 20 foot sea level rises is totally unfounded. No PhD-level climate scientist believes that yarn from science novice and professional politician Al Gore.
There's a few more things that Mr. Gore found too "inconvenient" to tell you, also.
Al Gore's movie makes it look like we have no choice but to shut down our economy by limiting our emissions of CO2 per the Kyoto Treaty. However, the Kyoto treaty is no answer, because IT CANNOT COOL THE WORLD AT ALL BY 2100!
The reason for this is simple. China has been ramping up its program of industrialization for more than a decade before the Kyoto treaty was even completed in 1997! This makes a mockery of the Kyoto's exemption of China from restrictions on CO2 emissions, since it has been dramatically increasing them ever since 1997.
"China's total carbon dioxide emissions increase from 2,629 million metric tons (MmtCO2) in 1995 (12% of the total 1995 world emissions of 22,048 MmtCO2) to 12,435 MmtCO2 in 2025 (a factor of 4.7 or 370%). By 2025, China will generate carbon dioxide in an amount that is more than half that of the 1995 worldwide carbon dioxide emissions, indicating a potential difficulty in effectively limiting future worldwide emissions without Chinese cooperation."
This source plainly shows that China, all by itself, threatens to overcome all other nations' reductions in CO2 emissions. China has plans for building hundreds of new coal-fired generating plants to electrify all of China as soon as they can get them built. Obviously, at the rate they are expanding emissions, continued through 2050, they will more than wipe out the measly 0.07 degree C "cooling" projected for Kyoto by 2050. Beyond that, the continued expansion in China, with its immense area and overwhelmingly large population in the billions, will output enough CO2 long before 2100 to make the Kyoto treaty a joke, and the earth will continue warming by 2100 instead of being cooled by fruitless Kyoto limits.
Thus, Al Gore "forgot" to tell us about how impossible it would be for Kyoto to do any real diminishing of all his projected global warming from CO2 emissions. Even if his alternates would eventually be able to replace over 50% of the nation's CO2-emitting energy uses, THAT STILL WOULD NOT DIMINISH ANY SIGNIFICANT GLOBAL WARMING BY 2100! Clearly, the escallating expansion of China's emissions will outdo any saving that all the rest of the nations can make, and the earth will warm somewhat anyway.
In the meantime, what about all those alternates that Al Gore promotes so glowingly? Will they get established nationwide soon enough to even make it possible to cut down our CO2 emissions drastically by 2050? Not likely!
Windmills are already getting rejection from citizen's groups which protest their ugly defacing of pristine countrysides. Even environmentalist Sen. Kennedy signed a bill preventing windmill farms on eastern areas that he wanted to keep free of their unsightly appearance.
First and foremost, there can be no reduction in CO2 emissions from all the aircraft of our nation, wherever they may fly around the world. All of Gore's alternate energy sources are too heavy, bulky, or weak to be useful in aircraft. Thus, all jet fuel and aircraft-grade gasoline has to be kept immune from Kyoto restrictions to keep from strangling our nation's airlines and private aircraft, not to mention our military aircraft.
Al Gore's other alternates don't fare too well, either. His recommended "saving" of power used for heating and cooling by making them more efficient is unrealistic. That's in my area of electronic engineering, and I've followed reports such as Honeywell's use of computer-controlled redistribution of thermal energy in large buildings which reduce the total power to maintain comfortable temperatures. Thus, the efficiency in that area is already close to its maximum, and there is just not that much more that can be done to reduce inefficiencies to save any significant amount of energy needed for that use.
Al Gore's recommendation for solar cells is also limited, and only works during daylight hours [obviously!]. Thus, it is a part solution at best, and requires substantial energy to manufacuture, as well as being quite costly. Solar cells won't be able to take much of the load of the electric power grid anytime soon, and certainly not enough to reduce emitting sources by very substantial amounts.
So, what do we have left? Fuel cell cars? That's another alternate that requires energy to produce the hydrogen to run them. Furthermore, we just now have a handful of fuel cell cars running experimentally on leases to individuals to test them out, after two whole decades of working to get that far! Total range is still limited to less than 300 miles, and the handling of hydrogen involves dangers. Thus, to get the cars finished in prototype testing, refined for mass manufacture, produced, sold and distributed across the nation will take at least a couple of decades more at present rates of development. There is still the huge problem of setting up the entire nationwide infrastructure of both refueling stations and repair facilities. That is still not to mention reducing their cost sufficiently to induce Americans to trade off their capable gas-powered cars for the new and possibly too-high-priced technology with quite limited range.
Bottom line: NO WAY CAN WE FOLLOW AL GORE'S "ROAD MAP!" IT ONLY LEADS TO ECONOMIC RUIN, MASS UNEMPLOYMENT, AND NO SIGNIFICANT COOLING OF EARTH'S FUTURE WARMING!
A much better plan is to stop interfering with the honest investigations of dissenting scientists like Richard Lindzen, PhD. They need to be funded to continue their research to check out Dr. Lindzen's "Iris effect" of high altitude clouds that limit CO2 warming like a thermostat. If that turns out to be authenticated by further research, it could save us all from the destructive experimentation with severely limiting our economy to try a Kyoto treaty that cannot solve warming.