Also, I've heard scientists going on about how there's a strong correlation between the activities of the sun and the temperature on Earth. I don't really understand it myself, but there are other scientific explanations to global warming that make a lot more sense than carbon dioxide emissions. But I still think we should be looking at more sustainable energy regardless.
let me explain a bit, actually let the lecturer from last yr explain a bit lol i think it relates to what ur saying
3 mechanism in which climate can vary and change
one of them is external factors which involve forcing of the system by environmental events or changes whose occurences are independent of the state of the system e.g., variations in the solar constant
the solar output is nearly constant over the last 1.8 million years... however the amount and distribution of solar radiation actually impacting the Earth varies due to our oritentation and orbit around the sun....
read about the milankovitch cycles... eccentricity (shape of Earth's orbit), obliquity (tilt of earth relative to solar plane) and precession (timing of the closest approach to the sun).... the full changing of the axial tilt occurs every 41000 year which effects seasonal strength.... eccentricity (occurs 100,000yrs) actually effects total solar radiation received...by 0.2%, so there must be feedbacks to amplify such variations...
ALSO
another external factor is sun spot variations
sunspots occur on regions of the sun that experience magnetism increases of two or three orders of magnitudem. this inhibits convection, so 500km deep, 4000-20000km pockmarks sppear on sun's surface. radiative temperature of 4.2-4.5k rather than the suns average 6k. sunspots appears darker and these can occupy up to 1-2% of solar surface. bright areas surround the sunspots, and these are responsible for the overall radiation from the sun being greater when the sunspots are numerous. more sunspots leads to more solar output.
sunspot cycles last on average 11 years. so varies by about 0.1% over a sunspot cycle which would correspond to a mean change of about 0.2 degrees at the Earth's surface if nothing else changes. ....... sun varies on scales of billion>11 years. however over the last 150 years, total output has varied by only 0.1%, uv portion has varied by 300%, which perhaps has amplified a feedback. thus mayeb responsible for some variability but not since 1980!. climate change in the last 10,000 years likely linked to sunspot activity and volcanic activity.... climate cahnge in the last 100 years strongly indicative of anthropogenic green house gases.
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