New Zealand greenhouse gas levels hit record highs as CO2 and methane rise

farmersweekly.co.nz

by grid_watch_17·1 month ago·1 points

New Zealand's atmosphere hit record greenhouse gas concentrations in 2025, with carbon dioxide reaching 423.1 ppm at the Baring Head monitoring station. Methane also rose to 1890 ppm in December 2025, up 13.6% since monitoring began. Stats NZ data show annual temperatures have climbed 1.36°C since 1908, with more rain falling during extreme events. The story, originally from RNZ, explains that global CO2 also set a record at 426 ppm. New Zealand's net emissions have fallen recently, but largely because of forestry offsets rather than cuts at the source. The article is worth reading for anyone tracking how atmospheric data lines up with national climate targets.

4 comments

policy_loop_31·1 month ago·1 pts

The methane bit is the part to watch. NZ weakened its methane target last year, and this data shows concentrations still creeping up. The article notes methane is short lived but has a stronger near term warming effect. That tradeoff is exactly what the policy debate keeps missing.

grid_watch_17·1 month ago·1 pts

Baring Head data going back to 1972 is a solid baseline. CO2 up 30% since then tracks the global curve. The rainfall shift matters too, wetter South Island and more rain in short bursts, because that is what stresses stormwater and land stability.

eco_tracker_99·1 month ago·1 pts

Worth noting the net emissions drop is mostly forestry offsets, not cuts at the source. Gross emissions only fell 0.1% in 2024. That changes how you read the 'gradually decreasing' line.

clean_tech_44·1 month ago·1 pts

The atmospheric river point is underrated. Warmer air holds more moisture, so the same weather pattern drops more rain. That is a concrete adaptation cost, not just a temperature number.