COP28 president urges nations to update NDCs to cover methane, other non-CO2 greenhouse gases

COP28 president urges nations to update NDCs to cover methane, other non-CO2 greenhouse gases

Subject : Environment

Section: Int Conventions

Context:

The recent summit on methane and other non-CO2 greenhouse gases held on December 2nd, 2023, marked a critical juncture in the fight against climate change. It highlighted the growing recognition that tackling methane, responsible for 50% of global warming, is indispensable for keeping the 1.5°C goal within reach

While carbon dioxide (CO2) gets all the attention, there are several other sneaky players in the greenhouse gas game. These non-CO2 gases, though less abundant, pack a powerful punch when it comes to trapping heat and warming the planet.

Here are some of the key culprits:

• Methane (CH4): This potent gas, over 80 times more effective than CO2 at trapping heat, comes from a surprising variety of sources. From leaky gas pipelines and burping cows to decomposing landfills and even rice paddies, methane’s reach is far and wide.
• Nitrous oxide (N2O): This invisible troublemaker, 300 times more potent than CO2, has a more specific origin story. Think fertilizers applied to fields, the burning of fossil fuels, and even the treatment of wastewater. Every time these activities take place, a bit more N2O sneaks into the atmosphere.
• Fluorinated gases (F-gases): This diverse group of human-made chemicals, including refrigerants, foam-blowing agents, and even some medical inhalers, are all masters of heat absorption. Though individually not as potent as methane or N2O, their sheer number and long atmospheric lifespan make them a force to be reckoned with.
• Ozone (O3): This blue beauty shields us from harmful UV rays but also absorbs infrared radiation, warming the planet. While stratospheric ozone is our friend, the pollutant ozone closer to the ground is not.
• Black Carbon (BC): This sooty char, emitted from burning fuels and deforestation, hangs out in the atmosphere, absorbing sunlight and warming the planet directly. It also darkens snow and ice, reducing their ability to reflect heat, creating a vicious cycle.
• Water Vapor (H2O): The most abundant greenhouse gas, water vapor, is a double-edged sword. It amplifies the warming caused by other gases but also forms clouds that reflect sunlight, cooling the planet. Its complex role makes it a climate wild card.
• Sulfur Hexafluoride (SF6): This electrical insulator may be invisible, but its heat-trapping power is monstrous.