A solution to global warming

Spanish researcher Jiménez Aguilar has proposed that a substance that's cheap and readily available — urine — might be able to soak up excess carbon dioxide in the atmosphere. He says, "For every molecule of urea in urine, one mole of ammonium bicarbonate is produced along with one mole of ammonia, which could be used to absorb one mole of atmospheric CO₂." His idea is to place urine-based filters in chimneys, forcing exhaust gases to pass through the urine, and so remove the CO₂. He imagines urine filters for cars as well as domestic and industrial chimneys. [alphagalileo.org]