Watched Katharine Wilkinson get interviewed on TVO - The Agenda. Her response to trying to explain a gigaton of CO2 was to compare it to cows. She claims that cows weigh a ton.
See it here at about 7 minutes in:
https://tvo.org/video/programs/the-agenda-with-steve-paikin/solving-climate-change-a-blueprint
See it here at about 7 minutes in:
https://tvo.org/video/programs/the-agenda-with-steve-paikin/solving-climate-change-a-blueprint