Image caption
By the early 21st century, young, thin, melt-prone ice had come to dominate the Arctic Ocean. Credit: NOAA Climate.gov / Mark Tschudi
File: jul-20-2021-ice-free-arctic.png
By the early 21st century, young, thin, melt-prone ice had come to dominate the Arctic Ocean. Credit: NOAA Climate.gov / Mark Tschudi