SensibleFarmer said "Weather has only been recorded in the last 120 or so years. What you are referring to, I believe, is the scientific exploration of ice, sediment in the oceans, rock formations and tree rings that give a footprint of times long ago.
Some interesting discussion on climate change and what we can do. There is no doubt that mankind is contributing to the CO2 levels but we, in some countries, are responding slowly to reducing the emissions by using new technologies. It is the countries like China that have no regard for the climate .
However we will never stop climate change as the earth's orbit is ever changing. When you look back in time we have always had "climate change".
At one time Greenland was green-that's how it was named. They have found evidence of vineyards in northern Scotland where grapes can not grow now.
Then came the ice age and when it started to recede we had Lake Agassiz form in the prairies.
During these periods there was no carbon emissions from man that caused climate change. It is a naturally occurring event which we cannot change.
These changes will never stop, but we can continue to do our part to reduce (as we are) the emissions of CO2. We must also learn to adapt to changes that we have no control over. "
There have been a number of glacial cycles over roughly the last 3/4 million years. Long ago it was figured out that this coincides with a long term wobble in the earth's inclination, called precession. According to the earth's precession we should be starting into another ice age now. It appears that by coincidence forest clearing and rice farming (methane emissions) offset the cooling trend. Burning of coal and oil has now set it catastrophically in the other direction.
I understand it is the latest right wing talking point to say "the climate has always been changing". And of course in the broadest sense this is true. Just as it's true to say every day is different. What is unprecedented is our burning all the fossil hydrocarbons we could find over 300 years, half of that total over the last 30. CO2 levels are now getting higher than any known time in the last 250 million years. It's pretty simple equation. You burn a ton of coal, and end up with 2 tons of CO2 in the atmosphere. It accumulates there, and over thousands of years will be absorbed into the oceans. In the meantime heating will occur, and in this case so much is there it will cause runaway natural emissions and climate change beyond anything our civilization or farming economy can survive.
Sorry to burst the bubble, but the ice core records give us a very high quality year by year weather record, going back 3/4 million years. The air bubbles trapped the atmospheric gas concentrations, so they are indisputable to parts per million over that time. The isotopes of water tell the mean ocean surface temperatures, so we have a very reliable record in those cores. We also have historical data, and daily weather data going back 200 years in some places.
Greenland was named so by Eric the Red around 1000 AD. It was largely a PR effort to get people to come from Iceland. There were green fjords, where they farmed for 400 years. It was green to some degree prior to 750,000 years ago.
Lake Agassiz formed as the Laurentide ice sheet a mile thick melted back from it's maximum starting around 12,000 years ago.
I'm calling for a fact check on the Scottish vineyard claims.
Edited by GarryTait, 2019-10-27 10:59:21