To produce high weathering effects, we turned our greenhouse "up to 11": but where on Earth would that be?

When we set up our greenhouse experiment in 2023 we deliberately maximised weathering to get the strongest possible signal: we turned every dial to "11", soil held at 19–30 °C, plants growing throughout the year, and we aimed for a lavish ~2,000 mm of irrigation a year (in summer we even had to apply up to 4000 mm, because otherwise we would not have collected enough leachate to measure carbon…