yes that IS what I said "OVER 50 years now" which means "longer than".
Yes, I was agreeing with you.
90% lol proven...no it isn't.
Sure it is. Go and read virtually any study on the causes of recent global warming.
US EPA: "This record shows that the climate varies naturally over a wide range of time scales, but this variability does not explain the observed warming since the 1950s. Rather, it is
extremely likely (> 95%) that human activities have been the dominant cause of that warming."
US Fourth National Climate Assessment: "The likely range of the
human contribution to the global mean temperature increase over the period 1951–2010 is 1.1° to 1.4°F (0.6° to 0.8°C), and the central estimate of the observed warming of 1.2°F (0.65°C) lies within this range (high confidence). This translates to a
likely human contribution of 92%–123% of the observed 1951–2010 change. The likely contributions of natural forcing and internal variability to global temperature change over that period are minor (high confidence)."
Ribes et al (2016) "Consistent with the last IPCC assessment report, we find that most of the observed warming over this period
(+0.65 K) is attributable to anthropogenic [human made] forcings (+0.67, +/- 0.12 K, 90 % confidence range), with a
very limited contribution from natural forcings (-0.01, +/- 0.02K).
Like I said - more than 90% of the present warming is the result of human activities.
100% of climate change occurs because it has occurred previously (proven through science) and will continue....cycles in the sun....it is natural. The earth has heating and cooling periods throughout history.
Climate change has occurred previously. Climate change always occurs. Whats concerning is the rate, extent and direction of the current change.
If you look at natural cycles, the earth should be in a very, very mild cooling period. But, instead we're in a warming period.
The rate of warming is unlike anything our species has experienced. The temperature of the planet is going up faster than any time since humans became a species. It may be going up faster than any time within the last 20 million years.
The extent of warming is also a problem. Not only is temperature going up rapidly, its going to continue going up for at least another century. Atmospheric carbon has a warming impact of at least 100 years, although better than 75% the warming impact is experienced during the first 30 years.
If we cut all GHG emissions now, our great-great-great grandchildren will be experiencing warming from the carbon that we burned.
Like I said, HUMAN change like city smog is a LOCAL thing, not global.
It's both. Human effects are local and global - those things are not mutually exclusive, and can be mutually reinforcing for some impacts.
Here's the global atmospheric carbon level from four different sites:
If human changes are local, then why is atmospheric carbon growing equally rapidly in Hawaii, the Northern tip of Alaska, the South Pole and American Samoa?
I could cite data and studies and experts until I'm blue in the face, but I suspect that you're not going to reverse course are you?