Humans have caused about 1.0°C (1.8°F) of global warming since pre-industrial levels, according to scientific estimates.

At the current rate, global warming is likely to increase to 1.5°C (2.7°F) between 2030 and 2052. 4°C by 2100.

Limiting warming to 1.5ºC (2.7°F) isn't impossible, but would require unprecedented transitions in all aspects of society.

CO2 concentration in Earth's atmosphere currently at 412 parts per million, the highest it has been in 800k years. Current rates of CO2 emissions today are 10x greater than they were during the end permian mass extinction which killed 97% of life on Earth.

at 2 degrees global temp rise (we are on track to hit 2 degrees by 2050 population 8 billion)
- agriculture yields significantly less bountiful
- less food for more people
-hurricanes and floods, extreme weather would dramatically increase
-4x as many wildfires in California .

4 degrees global temp rise (we are on track to hit 4-5 degrees by 2100 population 11 billion)
-all major ice sheets in the planet would begin permanent irreversible melt which means we would lose all ice no matter what we did that ice together would add at least 200 feet of sea level rise to the planet, inundate every single beach you've ever been to. the entire coastline of the world on which 2/3 of all major cities exist would be unrecognizable.
-world gdp 20-30 percent smaller than it would be without climate change. 30 percent is an impact twice as deep as the great depression in the 1930s and it would be forever. roughly 600 trillion dollars in global climate damages which is double the amount of money than currently exists in the world
-agricultureal yields would be half as productive.
-mosquitos carrying dengue and malaria would reach around the world up to the arctic circle.

notes taken from years of living dangerously project with david wallace wells

Forests are a fundamental component of our planet's recovery. They are the best technology nature has for locking away carbon. And they are centers of biodiversity. The wilder and more diverse forests are the more effective they are at carbon sequestration. 1900 75% of Costa Rica was covered in forest. by 1980 it was down to 25%. With Government incentives to plant native tree species, today, 40 years later 50% of the nation is covered in forests.If we could apply this scenario to the entire planet, the additional forests would sequester up to 2/3 of all carbon emissions emitted by humans to date.

14 million years: The first great apes appeared.
530,000 years: Development of speech in Homo Heidelbergensis.
400,000 years: Hominids hunted with wooden spears and used stone cutting tools.
370,000 years: Human ancestors and Neanderthals were fully separate populations.
350,000 years: Evolution of Neanderthals.
300,000 years: Hominids used controlled fires.
Neanderthal man spread through Europe

200,000 years: Anatomically modern humans appeared in Africa.
105,000 years: Stone age humans foraged for grass seeds such as sorghum.
80,000 years: Non-African humans interbreed with Neanderthals.
60,000 years: Oldest male ancestor of modern humans.
40,000 years: Cro-Magnon man appeared in Europe.
30,000 years: Neanderthals disappeared from fossil record.
First domestic dogs.

15,000 years: Bering land bridge between Alaska and Siberia allowed human migration to America.
12,000 years: Fired pottery invented.
9,000 years: Metal smelting started.
5,500 years: Invention of the wheel.
5,300 years: The Bronze Age.
5,000 years: Development of writing.
4,500 years: Pyramids of Giza.
3,300 years: The Iron Age.
2,230 years: Archimedes advanced mathematics.
1350: Black death kills 1/3 of human population.
1800: Industrial Revolution.
1804: Human population hits 1 billion (it took 200,000 years to reach 1 billion humans, 200 years to reach 7 billion)
1930: Human population hits 2 billion
1957: Satellites orbited Earth.
1960: Human population 3 billion
1969: Human walked on the surface of the Moon.
1974: Human population hits 4 billion
1987: Human population 5 Billion
2011: 7 Billion
A third of all green house gas emissions in the atmosphere emitted by humans occurrs between 2003-2020 .
2023: Human population hits 8 Billion
2040 Amazon Rainforest is estimated to be degraded to dry Savannah.