The paint’s properties are almost superheroic. It can make surfaces as much as eight degrees Fahrenheit cooler than ambient air temperatures at midday, and up to 19° cooler at night, reducing temperatures inside buildings and decreasing air-conditioning needs by as much as 40%. It is cool to the touch, even under a blazing sun, Dr. Ruan said. Unlike air-conditioners, the paint doesn’t need any energy to work, and it doesn’t warm the outside air. Jeremy Munday, a professor of electrical and computer engineering at the University of California, Davis, calculated that if materials such as Purdue’s ultra-white paint were to coat between 1% and 2% of the Earth’s surface, slightly more than half the size of the Sahara, the planet would no longer absorb more heat than it was emitting, and global temperatures would stop rising.
- Date Posted:
- July 13, 2023
As a share of global economic output, manufacturing has dropped from 19% in 1997 to 16% today, with the fall steepest in rich countries. In China and India industry’s share of economic output appears to be roughly where it was three decades ago, but even in these countries, it has slipped in recent years. In recent decades there has been next to no relationship between economic growth and manufacturing’s share of the economy among countries in the OECD.