Atmospheric gasses.

A look at Atmospheric gasses the climate data

Atmospheric Composition & Greenhouse Forcing

Atmospheric Composition (by Volume)

Gas % Volume Role 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 Gas Forcing Main Sources
COâ‚‚ 1.82 Fossil fuels, deforestation
CHâ‚„ 0.48 Agriculture, landfills
Nâ‚‚O 0.17 Fertilizers, combustion
Halocarbons 0.34 Industrial chemicals

Forcing Comparison Bar Chart

COâ‚‚
CHâ‚„
Nâ‚‚O
Halocarbons

Atmospheric Gas Concentrations

Latest CO2 Data

Date: 2026-3-20

Cycle: 429.10 ppm - Trend: 427.43

 Pre-Industrial: Approx: 280 ppm

Latest Methane Data

Date:2025.11

Average: 1945.85 ppb - Trend: 1939.18

 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