Atmospheric gasses.

A look at Atmospheric gasses the climate data

Atmospheric Composition & Greenhouse Forcing

Atmospheric Composition (by Volume)

Gas% VolumeRole in GHE
Nitrogen (Nâ‚‚)78.08%Minimal
Oxygen (Oâ‚‚)20.95%Minimal
Argon (Ar)0.93%Negligible
Carbon Dioxide (COâ‚‚)0.04% (~400 ppm)Major contributor
Methane (CHâ‚„)0.00019% (~1.9 ppm)Strong per molecule
Nitrous Oxide (Nâ‚‚O)0.00003% (~0.3 ppm)Potent but less abundant
Water Vapor (H₂O)Variable (0–4%)Dominant natural GHG (feedback)

Relative Radiative Forcing (W/m²)

Greenhouse GasForcingMain Sources
COâ‚‚1.82Fossil fuels, deforestation
CHâ‚„0.48Agriculture, landfills
Nâ‚‚O0.17Fertilizers, combustion
Halocarbons0.34Industrial chemicals

Forcing Comparison Bar Chart

COâ‚‚
CHâ‚„
Nâ‚‚O
Halocarbons

Atmospheric Gas Concentrations

Latest CO2 Data

Date: 2026-6-29

Cycle: 427.68 ppm - Trend: 427.79

 Pre-Industrial:Approx: 280 ppm

Latest Methane Data

Date:2026.2

Average: 1940.46 ppb - Trend: 1939.67

 Pre-Industrial:350 to 800 ppb

Mauna Loa CO2 in 2025

Arctic Sea Ice Minimum Extent

Million square kilometres
ArcticSeaIceMin slope: -0.078 per decade (million km²)
7.50
7.20
6.80
6.50
6.00
5.60
5.10
4.50
4.20
4.00