Under the 2015 Paris climate agreement, nations must revisit their previous pledges to curb carbon pollution every five years and then announce plans to cut even more and do it faster, says The Associated Press. After a year’s delay because of the pandemic, the two-week summit starting Sunday in Glasgow is the first to include the required ratcheting up of ambitions.
The main goal set in Paris was to limit warming to 1.5 degrees Celsius (2.7 degrees Fahrenheit) since preindustrial times. The world has warmed 1.1 degrees Celsius (2 degrees Fahrenheit) since then.
Every analysis of current climate change pledges shows they'll lead to at least another degree or degree-and-a-half Celsius of warming (about 2 to 3 degrees Fahrenheit), according to AP.
All five emissions scenarios studied in a U.N. scientific assessment in August suggest that the world will cross that 1.5-degree-Celsius threshold in the 2030s, though some researchers say it's still technically possible to stay within that limit or to temporarily go over it and come back down.
Small island countries and other poor, vulnerable communities said in 2015 that 2 degrees would wipe them out, and they insisted on the 1.5-degree threshold.
The five top issues in Glasgow, according to AP:
— $100 billion a year for poor countries
Rich countries like the United States and European countries developed carbon-emitting energy and caused most of the problem historically, but now they're asking poor nations to cut or eliminate the use of fossil fuels. In return, they pledged in 2009 and reaffirmed in Paris to provide $100 billion a year by 2020 to help developing countries switch to clean energy.
The Washington-based World Resources Institute calculates that only a few rich countries, including France, Japan, Norway, Germany and Sweden, have provided their fair share. The United States, Australia and Canada have fallen far short.
The funding for 2019 is estimated at slightly less than $80 billion.
One solution proposed this week is for the payments to average $100 billion a year from 2021 to 2025, with the shortfall in earlier years made up for by higher payments later on.
— Carbon trading
Some unfinished business from the Paris summit involves rules for international carbon trading, which is seen as a key instrument to harness market forces to combat climate change.
The rules are critical because for many countries and companies to achieve “net zero” emissions by midcentury, pollution will have to be balanced by an equal amount of carbon captured elsewhere, such as by forests or through technological fixes, says AP.
— Transparency, new targets
The voluntary nature of the Paris accord means countries closely watch how much progress others make before ratcheting up their targets another notch.
— Methane
As a greenhouse gas, methane is about 20 times more potent than carbon dioxide but stays in the atmosphere for only about a decade. Cutting emissions by fixing leaks in gas pipelines and limiting flaring at drilling sites would provide a small but noticeable improvement, AP says.
— Cutting emissions 45 percent by 2030
The U.N. has set this as a goal for the talks to be considered a success, but emissions now are going up rather than down, says AP.
Cutting emissions in half in the next decade is considered a key step to net zero by 2050, which scientists say is the only way to achieve the Paris agreement's goal of capping global warming at 1.5 Celsius (2.7 Fahrenheit) by the end of the century.