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One of these ridges — known as the “subtropical ridge” — typically circles the globe at around 30 degrees latitude and gives rise to the Arabian, Saharan, and Sonoran deserts.

It’s a distinctive three-part wave in the atmosphere that creates perfect conditions for fire, and it’s occurring more often since 1980, driven by warming in the subtropical eastern Pacific Ocean.

Boosters nevertheless clung to citrus and its markers — the smell of orange blossoms, the crate labels with idyllic scenes of Old California — as proof of our subtropical paradise.

In the dark and moist understories of the subtropical forests of Shimoshima Island in Japan grow parasitic plants that feed on the roots of other plants.

It is usually found in tropical and subtropical regions.