44 billion t
max in 2020 if we are to avoid catastrophe
In order to limit the rise in average global temperatures to 2 degrees Celsius by 2100, the UN-affiliated Emissions Gap Report of 2013 "recommends that emissions should reach a maximum of 44 gigatonnes of CO2 by 2020, falling to 40 gigatonnes by 2025 and further to 22 gigatonnes by 2050."1
40 billion t
max in 2025 if we are to avoid catastrophe
37 billion t
world total emissions in 20172
20 billion t
max in 2050 if we are to avoid catastrophe
annual average per American3
Includes 8.5 t due to government services when equally divided between all Americans. Another source says the the total is 16.4 t.4
flying SF to London business class nonstop round trip5
This uses a radiative forcing factor. Without radiative forcing, it's 4.00 t.
annual average per human
Assuming 7.5 billion humans in March 2018.6
annual gas consumption of my home
Assuming 0.0061 t per therm for PG&E,7 and assuming that our gas usage in Feb 2018 was 50% more than monthly average. EPA suggests national average is 0.0053 t per therm.8
driving SF to FB HQ round trip by every weekday for a year9
28 MPG, 28 miles x 2. One trip is 0.017 t.
flying SF to London economy class nonstop round trip5
This uses a radiative forcing factor. Without radiative forcing, it's 1.38 t.
driving SFO to JFK round trip9
28 MPG, 2939 miles x 2
annual electricity consumption of my home
Assuming 0.0197 t per MWh for PG&E,10 and assuming that our electricity usage in Feb 2018 was equal to the monthly average. EPA suggests national average is 0.0744 t per MWh.8
flying SFO to JFK economy class nonstop round trip5
This uses a radiative forcing factor. Without radiative forcing, it's 0.61 t.
eating 1 lb beef per week for a year
Assuming 0.022 t per kg beef.11 Average American beef consumption was 1.07 lb per week in 2016.12
driving SF to Caltech round trip9
28 MPG, 387 miles x 2
flying SFO to LAX economy class nonstop round trip5
This uses a radiative forcing factor. Without radiative forcing, it's 0.08 t.
driving SF to Yosemite Valley round trip9
28 MPG, 194 miles x 2
drinking 1/2 gallon cow milk per week for a year
Assuming 0.001 t per kg milk.13 Re-calculating with numbers from a different source, total is 0.12 t to 0.15 t per year.14 Assumes 1 gallon of milk weighs 8.6 pounds.
drinking 1/2 gallon soy milk per week for a year
Well, calculating with numbers from source 14, the total is 0.079 t to 0.089 t per year.
driving SF to San Jose round trip9
28 MPG, 48.5 x 2 miles