Planting trees will not necessarily slow climate change.

Kim Naudts at the Laboratory of Climate Science and Environment in Gif-sur-Yvette, France, and her colleagues paired a history of land-use in Europe with land and atmospheric models to study the effect of forests on the climate. Although the continent's forests have expanded by 10%, timber harvesting and a shift to more commercially valuable trees — mainly the fast-growing conifers — have resulted in the release of more than 3 billion tonnes of carbon into the atmosphere since 1750.

The change from deciduous trees to darker-leaved conifers contributed to a rise of 0.12 ° C in local surface temperatures.

Science 351, 597–600 (2016)