To avoid such a scenario, Lunt says Angel's project would have to operate at half strength; all of which reinforces his view that the best option is to avoid the need for geo-engineering altogether.

A rosy view of Italy’s economy relies on two assumptions that are only half right.

According to Bowdoin College psychologist Barbara Held, PhD, for those with a glass-half-empty view of the world, all this happy talk can be downright depressing.