Because data are needed in order to understand which actions can help reducing CO2 emissions.

• Natural earth CO2 emissions: 100 billion of tons (https://climate.mit.edu/ask-mit/how-much-carbon-dioxide-does-earth-naturally-absorb)
• CO2 emissions due to human activities: total of 41 billion tones per year, and 37 billon from fossil fuels (https://ourworldindata.org/co2-emissions)

• Objective by 2050: Reaching net-zero CO2 emissions (European Climate Law)
• Objective by 2030: At least 55% cuts in greenhouse gas emissions (from 1990 levels) (European Climate Law)
• Objective by 2030: According to Oxfam, every person on Earth would need to emit an average of just 2.3 tons of CO2 per year by 2030 (assuming 7.9 billions of people on earth)― this is roughly half the average footprint of every person on Earth today → Everyone has to divide by 2 its footprint
• National strategy: In 1990 546 MtCO2, 2019-23 around 422 MtCO2, objective for 2024-28 349 MtCO2, objective for 2029-33 300 MtCO2, and in 2050 80 MtCO2 (that is -11,5 MtCO2/year after 2030) (Stratégie Nationale Bas-Carbone (SNBC)). This goes with an increase of the CO2 absorption in order to reach 80 (absorbed) MtCO2 in 2050.

By income groups (https://www.oxfam.org/en/press-releases/carbon-emissions-richest-1-set-be-30-times-15degc-limit-2030):

• Richest 1%: 70 tons of CO2 per year per capita
• Richest 10%: 21
• Middle 40%: 5
• Poorest 50%: 1

The carbon footprint in France is estimated at 8.9 tonnes of CO2e per person in 2020 (https://www.statistiques.developpement-durable.gouv.fr/lempreinte-carbone-de-la-france-de-1995-2021).

Repartition in France (https://www.statistiques.developpement-durable.gouv.fr/edition-numerique/chiffres-cles-du-climat/7-repartition-sectorielle-des-emissions-de):

• Transportation: 41% (in average 2 tones for cars, 480 kg for planes)
• Residential: 13%
• Industry and construction: 13%
• Electricity production: 12%
• Energy (other than electricity): 9%
• Other (including tertiary): 12%

Repartition of CO2 (of energy origin only) emission per country per capita:

• US: 17,6 t
• Saudi Arabia: 15.7
• Russia: 8.8
• UK: 7.8 - EU: 7.8 - Germany: 10.4 - France: 6.8 - Spain: 6.1
• China: 6.3
• World: 4.4

Repartition of CO2 emission per country (total) https://ourworldindata.org/co2/country/:

• China: 11,472 billion tonnes - North America: 6,137 - USA: 5,007, Canada: 545
• Europe: 5,306 - EU: 3,139 - Germany: 674 - Italy: 328 - Poland: 328 - France: 305 - Spain: 233
• India: 2,709
• Russia: 1,755
• Africa: 1,450 - South of Africa: 435
• South America: 1,074, Brazil: 488, Mexico: 407
• Japan: 1,067
• Iran: 748
• Australia: 391

• CNRS (https://www.cnrs.fr/fr/cnrsinfo/transition-bas-carbone-un-plan-ambitieux-pour-le-cnrs): All inclusive, on average, the emissions from CNRS activities amount to nearly 14 tons of carbon equivalent per year per employee

• Apple (https://www.apple.com/environment/)
  • MacBook Air with M2 chip: 147 kg (69% production, 8% transport, 22% use)
  • MacBook Pro 14-inch: 243 kg (79% production, 1% transport, 20% use)
  • 24-inch iMac (with screen): 481 kg (45% production, 10% transport, 44% use))
• Dell (https://www.dell.com/fr-fr/dt/corporate/social-impact/advancing-sustainability/sustainable-products-and-services/product-carbon-footprints.htm)
  • Prevision Mobile 5570: 524 kg (83% production, 4% transport, 12% use)
  • Precision Mobile 7700: 489 kg (82% production, 4% transport, 13% use)
  • Precision 3660 Tower (without screen): 608 kg (46% production, 5% transport, 48% use)
  • Dell P2422HE (without screen): 542 kg (64% production, 8% transport, 28% use)
  • Screen Dell P2723QE: 727 kg (52% production, 12% transport, 35% use)

• Airplanes (direct flight) (source: https://co2.myclimate.org/)
  • Paris - Toulouse: 0.323 t / Paris - Nice: 0.346 t / Paris - Edinburgh: 0.393 t / Paris - Berlin: 0.390 t
  • Paris - Copenhagen: 0.429 t / Paris - Vienna: 0.437 t / Paris - Rome: 0.459 t
  • Paris - Lisbon: 0.552 t / Paris - Stockholm : 0.573 t
  • Paris - Riga : 0.618 t
  • Paris - New-York: 1.9 t / Paris - Toronto: 1.9 t
  • Paris - New Delhi: 2.1 t / Paris - San Francisco: 2.9 t
  • Paris - Tokyo: 3.2 t / Paris - Singapore: 3.6 t / Paris - Buenos Aires: 3.7 t / Paris - Santiago de Chile: 3.9 t
  • Paris - Sydney: 6.0 t

• Airplanes (with 1 stop) (source: https://co2.myclimate.org/)
  • Paris - Riga via Amsterdam: 0.772 t
  • Paris - New-York via Amsterdam: 2.2 t / Paris - New Delhi via Munich: 2.2 t
  • Paris - San Francisco via London: 3.1 t / Paris - Singapore via Istanbul: 3.6t
  • Paris - Santiago de Chile via Madrid : 4.0 t
  • Paris - Sydney via Singapore: 5.6 t

• Trains (source https://data.sncf.com/explore/dataset/emission-co2-tgv/table/ for trips in France)
  • Paris - Lille: 1.2 kg / Paris - Nancy: 1.8 kg
  • Paris - Rennes: 2 kg / Paris - Lyon: 2.4 kg
  • Paris - Bordeaux: 3 kg / Paris - Turin: 3.2 kg
  • Paris - Marseille: 4 kg / Paris - Toulouse: 4.4 kg / Paris - Bruxelles: 4.4 kg
  • Paris - Nice: 5.2 kg
  • Paris - Rome: 6.8 kg
  • Paris - Amsterdam: 7.6 kg / Paris - Berlin: 7.6 kg
  • Paris - London: 8 kg
  • Paris - Edinburg: 24.4 kg

• Medium-size car (SP95-E10, 7.5 l/km) (data for the car: must be divided by the number of passengers)
  • 1000 km: 343 kg (source https://co2.myclimate.org/fr/car_calculators/new/)
  • Paris - Lille (2x 223 km): 153 kg
  • Paris - Bordeaux (2x 584 km): 401 kg
  • Paris - Toulouse (2x 676 km): 463 kg
  • Paris - Marseille (2x 774 km): 531 kg

• Better airplanes: Skyteam Sustainable Flight Challenge: -30% CO2 emissions per passenger-km by 2030