I heard that around 140,000 or so years ago the earth was 2.5C hotter than it was at the start of the industrial revolution and the sea level was 6 metres or so higher than now.
How can co2 levels back then (280ppm ?) be well below today's levels (390ppm) but the Earth much warmer ? I thought co2 makes the earth warmer. I've seen al gores video and temperature records for 650,000 years. I thought today's temp is now the hottest it has ever been for 650,000 years because of human made co2. Was the graph wrong ? Because the temperature graph on al gore's video shows temperatures are the hottest today and no where shows this things I saw on a CATALYST episode. Now I've been told the earth was 2.5c hotter 140,000 or so years ago and which is well above the 0.75C rise in temperature of today. Can anyone shed some light on this. No bias, no outbursts.
How can co2 levels back then (280ppm ?) be well below today's levels (390ppm) but the Earth much warmer ? I thought co2 makes the earth warmer. I've seen al gores video and temperature records for 650,000 years. I thought today's temp is now the hottest it has ever been for 650,000 years because of human made co2. Was the graph wrong ? Because the temperature graph on al gore's video shows temperatures are the hottest today and no where shows this things I saw on a CATALYST episode. Now I've been told the earth was 2.5c hotter 140,000 or so years ago and which is well above the 0.75C rise in temperature of today. Can anyone shed some light on this. No bias, no outbursts.