<human>:  Who was the first person to propose the idea that the earth was warming?
<bot>: The first person to propose the idea that the earth was warming was Svante Arrhenius in 1896. He proposed that the amount of carbon dioxide in the atmosphere was increasing, and that this was causing the earth to warm. Arrhenius was a Swedish chemist who studied the effects of carbon dioxide on the atmosphere. He is often credited with predicting global warming in 1896, but he actually proposed the idea in 1896, and it wasn’t until the 1950s that the idea really took off.