Summer heatwaves are currently receiving a lot of attention in Europe because they now cause more deaths than floods or storms.

But winters are also warming. While they are generally less deadly, they influence and disrupt human and natural systems in many subtle ways.

Aotearoa New Zealand has experienced a particularly warm start to this winter, with record high June temperatures in the capital and warm conditions across the country.

Many will welcome the unseasonably warm weather, but milder winters have a range of impacts, especially for plants and insects.

Extra winter growth, but loss of carbon

In forests, warmer temperatures can extend the growing season of trees.

Usually, many trees are dormant during winter as conditions are too cold for growth. But our ongoing measurements of kauri tree growth in Auckland indicate trees have continued to grow throughout recent winters.

One might assume a longer growing season would increase carbon uptake and storage in trees. However, overall carbon changes are actually negative because warmer temperatures also increase respiration, which returns more carbon to the atmosphere.

In Aotearoa, few plant........

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