German scientists propose using basalt and dunite to soak up carbon from the atmosphere
They might seem solid, but rocks gradually erode. Wind, rain, ice and snow all contribute to weathering; nibbling away at mountains, sea cliffs, limestone pavements and even solid granite tors.
Freshly exposed rock surfaces react with carbon dioxide in the atmosphere to make bicarbonate ions, which flow down to the ocean (hitching a ride on rivulets of rainwater) and are used by ocean critters to make limestone. This natural process helps to keep the Earth cool by removing carbon dioxide from the atmosphere and locking it up in rocks underground for a few million years.