Economist Nouriel Roubini, often dubbed "Dr. Doom," has revised his outlook on the U.S. economy, predicting a more optimistic future driven by advancements in artificial intelligence and nuclear fusion energy. Roubini now forecasts a potential GDP growth increase from 2% to 4% by 2030, alongside high single-digit gains for U.S. stocks, such as the S&P 500, in 2025. Roubini attributes this positive shift to the rapid deployment of AI technologies and the nearing commercialization of nuclear fusion, which he believes will spur an investment and productivity boom. Despite acknowledging risks like geopolitical tensions and debt, he maintains that these are manageable, underscoring his stance as a realist rather than a perpetual pessimist.