Last week, Mark Zuckerberg declared that Meta aims to achieve smarter-than-human AI. The second ingredient is AI itself. Zuckerberg recently said on an earnings call that Meta will focus on building self-improving AI—systems that can bootstrap themselves to higher and higher levels of performance. —Grace HuckinsThe greenhouse gases we're not accounting forBack in 2021, climate scientists noticed that levels of methane had soared in the atmosphere the previous year, rising at the fastest rate on record despite the global covid-19 lockdowns. Researchers eventually spotted a clear pattern: Methane emissions had increased sharply across the tropics, where wetlands were growing wetter and warmer.