Posted at 5:00 a.m.
Another IPCC report?

PHOTO DAVID GRAY, REUTERS ARCHIVES
Coal-fired power plant in northern China
The Intergovernmental Panel on Climate Change (IPCC) published the third part of its sixth assessment report on Monday. This new report focuses on climate change mitigation measures. You will find there, in a way, the most recent instructions for limiting global warming to 2 ℃ and, ideally, to 1.5 ℃. However, if the trend continues, the planet is heading towards an average warming of 2.7 ℃ by the end of the century.
An increasingly narrow path

PHOTO MICHAEL SOHN, ASSOCIATED PRESS ARCHIVES
Congested avenue in Berlin, Germany last month
The more time passes, the more the “window of opportunity” to achieve the 2015 objectives of the Paris agreement closes. That year, greenhouse gas (GHG) emissions totaled 40.2 billion tonnes and the concentration of CO2 in the atmosphere peaked at 400.91 parts per million (ppm). Seven years later, the picture has gotten worse.
Short-lived setback

PHOTO MARTIN TREMBLAY, PRESS ARCHIVES
Saint-Denis Street, in Montreal, deserted during the spring 2020 confinement
The decline in global GHG emissions in 2020, to 38 billion tonnes, was only short-lived. With global economic activity picking up in 2021, emissions from the energy sector alone totaled 36.3 billion tonnes.

INFOGRAPHIC THE PRESS
CO concentration2 in the air
According to the Global Carbon Project, an international group of scientists, 2021 should approach the all-time high of 2019, when emissions totaled 40.5 billion tonnes.
45%

PHOTO ALKIS KONSTANTINIDIS, REUTERS
Siltation of houses around the city of Ambovombe, Madagascar
According to the IPCC, we would have to reduce our GHG emissions by 45% by 2030 to limit global warming to 1.5 ℃. In reality, we should instead expect a 16% increase in emissions by the end of the decade, taking into account all the commitments submitted to the Glasgow Summit last November.
420.49ppm

PHOTO ARIF ALI, AGENCE FRANCE-PRESSE ARCHIVES
Lahore, Pakistan under smog in February 2021
It was the concentration of CO2 into the Earth’s atmosphere on March 29. This unit of measurement, parts per million (ppm), indicates the number of molecules of CO2 for every million air molecules. However, the higher the concentration, the higher the temperatures on Earth.

INFOGRAPHIC THE PRESS
Global CO emissions2 of human origin
For 800,000 years, the concentration of CO2 had never exceeded 300 ppm, estimates NASA. This barrier was crossed at the beginning of the XXand century and has been pushed back ever since. Scientists have calculated that over the past 60 years, the rate of increase in atmospheric carbon dioxide was 1000 times faster than the natural increases that occurred at the end of the last ice age.
450ppm

PHOTO RONALDO SCHEMIDT, AGENCE FRANCE-PRESSE ARCHIVES
The Mexico megalopolis shrouded in a persistent cloud of fine particles
In 2014, the IPCC estimated 450 ppm as the limit not to be exceeded in order to limit warming to 2 ℃. On February 14, the Mauna Loa station in Hawaii recorded a concentration of 421.59 ppm, a level comparable to that which prevailed between 4.1 and 4.5 million years ago, according to the National Oceanic and Atmospheric Administration (NOAA). Since 1750, the level of carbon dioxide in the atmosphere has increased by 49%.
A carbon budget to respect

PHOTO FABRICE COFFRINI, AGENCE FRANCE-PRESSE ARCHIVES
Part of the Rhone Glacier in Switzerland, covered with an insulating tarp to try to stop its melting, last October
What is a carbon budget? Like any budget, the exercise makes it possible to set the level of expenditure not to be exceeded, otherwise it will be in deficit. The carbon budget determines the quantity of GHGs that can be sent into the atmosphere according to the targets set by the Paris agreement.
1.5℃ target
To limit warming to 1.5℃, the world has 420 billion tons of GHGs to spend, with a 50% chance of reaching this goal, according to the latest estimates from the Global Carbon Project. At the current rate of global emissions, this budget would be exhausted in 11 years.
2℃ target
To limit warming to 2℃, the world has 1270 billion tons of GHGs to spend, with a 50% chance of success. At the current rate, this budget would be exhausted in 32 years.
Solutions ?

PHOTO MAURO PIMENTEL, AGENCE FRANCE-PRESSE ARCHIVES
Cattle ranching on the remnants of a rainforest in Mato Grosso state, Brazil
In addition to the energy transition, the IPCC has already announced that part of its report will be devoted to technology. “Behavioral choices and lifestyles at the individual and societal level will also be addressed”. On this subject, a recent study conducted by researchers at the University of Leeds, in the United Kingdom, made it possible to target a few changes to the Western way of life that would make it possible to reduce global GHG emissions by 25%. Six changes were targeted:
- Reduce meat consumption as much as possible.
- Buy only three new clothing items each year.
- Keep your electronic devices for at least seven years.
- Fly a short flight (three hours or less) once every three years and a long flight once every eight years.
- If possible, do without a car, otherwise, keep your vehicle longer.
- Make a “systematic” change, for example, modify your retirement fund to no longer invest in fossil fuels, review the insulation of your home or your heating system if it runs on oil or gas.
Sources: IPCC, Global Carbon Project, Our World in Data, The GuardianFrance Media Agency