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April 8, 2021 Climate Change Weekly #393 Feeding the world’s hungry ranks among the greatest difficulties humankind has experienced throughout its history. With the Earth’s population expected to top nine billion between 2050 and 2100 (before starting a rapid decline), this challenge will likely worsen in coming decades unless people embrace increases in carbon dioxide and genetic engineering of crops.   Far from being an impediment to continued human existence, rising levels of carbon dioxide are part of the solution to world hunger.   The fact is, most plant li...

Significance Our new record of hydroclimatic change over the past ∼10,000 years in Arctic Alaska reveals that periods of reduced sea ice result in isotopically heavier precipitation derived from proximal, Arctic moisture sources. This systematic relationship is supported by isotope-enabled model simulations and a compilation of regional paleoclimate records. Periods of sea ice reduction also correspond to regionally wetter conditions. A transition from generally wetter conditions (∼10,000 y to 4,000 y ago) to relatively drier conditions (∼4,000 y ago to present) appears related to a rec...