🌍 Climate Feedback Gain Budget: Planck, Water Vapour, Lapse Rate, Albedo and Cloud Responses to a CO2 Step

Raise CO2 and watch a zero-dimensional Earth warm: the Planck response, water vapour, lapse rate, surface albedo and cloud feedbacks add up to a gain that sets equilibrium sensitivity, the warming timescale and the uncertainty spread, shown on a 3D globe with shrinking ice caps.