> accurately forecast what happens in 80 years. You can’t accurately forecast what the weather will be on June 28th 80 years from now, for the same reason you

> accurately forecast what happens in 80 years. You can’t accurately forecast what the weather will be on June 28th 80 years from now, for the same reason you can’t predict if it will be raining at your house at 3:29 pm two days from now, or where some molecule of water will end up in the Mississippi River an hour from now. But you can assuredly make less specific forecasts based on current trends. You know it’s likely to rain at some point in the morning two days from now, that the water molecule will flow roughly downstream, and that average air temperatures will increase if we keep putting CO2 in the atmosphere.