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originally posted by: seasonal
a reply to: Gothmog
True, there are those who focus on co2, and only co2. But the world, solar system and galaxy are huge places that are very complicated.
The .4 to .6 degrees C that the earth has supposedly heated up could very well be a normal and natural variation in a much bigger cycle.
originally posted by: Gothmog
They dont realize there are true sciences out there that go back millions of years .
It is. Since the 90s the sun has been in a gradual warming . Mars polar caps disappeared along with the Great Red Spot on Jupiter. And other events that have been attributed to the sun's heating. Just think , millions of years in the future the sun will have expanded to a size that completely engulfs the Earth . Now that is Global Warming...
It is. Since the 90s the sun has been in a gradual warming .
It is curious that the theory depends so much on sparse information – what we know about the climates on other planets and their history – yet its proponents resolutely ignore the most compelling evidence against the notion. Over the last fifty years, the sun’s output has decreased slightly: it is radiating less heat. We can measure the various activities of the sun pretty accurately from here on Earth, or from orbit above it, so it is hard to ignore the discrepancy between the facts and the sceptical argument that the sun is causing the rise in temperatures.
Mars polar caps disappeared along with the Great Red Spot on Jupiter. And other events that have been attributed to the sun's heating.
This is a round-up of the planets said by sceptics to be experiencing climate change:
- Mars: the notion that Mars is warming came from an unfortunate conflation of weather and climate. Based on two pictures taken 22 years apart, assumptions were made that have not proved to be reliable. There is currently no evidence to support claims that Mars is warming at all.
- Jupiter: the notion that Jupiter is warming is actually based on predictions, since no warming has actually been observed. Climate models predict temperature increases along the equator and cooling at the poles. It is believed these changes will be catalysed by storms that merge into one super-storm, inhibiting the planet’s ability to mix heat. Sceptical arguments have ignored the fact this is not a phenomenon we have observed, and that the modelled forcing is storm and dust movements, not changes in solar radiation.
- Neptune: observations of changes in luminosity on the surface of both Neptune and its largest moon, Triton, have been taken to indicate warming caused by increased solar activity. In fact, the brightening is due to the planet’s seasons changing, but very slowly. Summer is coming to Neptune’s southern hemisphere, bringing more sunlight, as it does every 164 years.
- Pluto: the warming exhibited by Pluto is not really understood. Pluto’s seasons are the least understood of all: its existence has only been known for a third of its 248 -year orbit, and it has never been visited by a space probe. The ‘evidence’ for climate change consists of just two observations made in 1988 and 2002. That’s equivalent to observing the Earth’s weather for just three weeks out of the year. Various theories suggest its highly elliptical orbit may play a part, as could the large angle of its rotational axis. One recent paper suggests the length of Pluto’s orbit is a key factor, as with Neptune. Sunlight at Pluto is 900 times weaker than it is at the Earth.