There's lots that we can do, but we have to act fast. Here's some ideas.

Various lists of the 100 companies:

https://b8f65cb373b1b7b15feb-c70d8ead6ced550b4d987d7c03fcdd1d.ssl.cf3.rackcdn.com/cms/reports/documents/000/002/327/original/Carbon-Majors-Report-2017.pdf?1499691240

https://www.theguardian.com/sustainable-business/2017/jul/10/100-fossil-fuel-companies-investors-responsible-71-global-emissions-cdp-study-climate-change

https://www.activesustainability.com/climate-change/100-companies-responsible-71-ghg-emissions/

https://www.sciencealert.com/these-100-companies-are-to-blame-for-71-of-the-world-s-greenhouse-gas-emissions

Sources:

https://www.reuters.com/business/environment/un-sounds-clarion-call-over-irreversible-climate-impacts-by-humans-2021-08-09/

https://twitter.com/POTUS/status/1424759606845313028

https://twitter.com/CreechJeff/status/1425924025662988292?s=20

https://twitter.com/BotheredBoy/status/1424813109785600009

https://www.cbc.ca/player/play/894872131944

https://financialpost.com/commodities/energy/oil-gas/people-need-to-accept-that-canada-is-the-fourth-biggest-producer-of-oil-in-the-world-seamus-oregan

https://thenarwhal.ca/canada-oil-gas-iron-earth-poll/

https://www.theguardian.com/sustainable-business/2017/jul/10/100-fossil-fuel-companies-investors-responsible-71-global-emissions-cdp-study-climate-change

https://www.ucdavis.edu/news/feeding-cattle-seaweed-reduces-their-greenhouse-gas-emissions-82-percent

https://www.wwno.org/latest-news/2020-07-31/protesters-block-civil-court-city-hall-entrances-to-prevent-evictions

https://gothamist.com/news/decolonizefareevasionnprotest

https://splash247.com/longshoremen-strike-at-port-of-montreal/

https://www.peoplesworld.org/article/ilwu-shuts-down-west-coast-ports-to-honor-juneteenth/