Climate change will increase opportunities to see rainbows, according to a new study. The study’s authors estimate that by 2100, the average land location on Earth will experience about 5% more days with rainbows than at the beginning of the 21st century.Climate change will increase opportunities to see rainbows, according to a new study. The study’s authors estimate that by 2100, the average land location on Earth will experience about 5% more days with rainbows than at the beginning of the 21st century.