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Because shield volcanoes are very rare and so are temperate broadleaf forests in scale to the surface of the earth. and a true red volcano pretty much has to be a shield volcano (I think). There is Rangitoto in NZ which is dormant and there is an active one in South Korea, in temperate biome but there aren't a lot of trees. The reunion island does sit just inside the tropic of Capricorn so you can't count that. But otherwise there are 3 places on earth where they occur in a mass at the moment, Rift Valley, Hawaii and Iceland.
It is an interesting question Anon, it's also got a lot to do with volcanic hotspots which don't often occur on continental shelf, as opposed to subduction zone type volcanoes, perhaps it even has something to do with the way magma is moving inside the earths mantle, maybe causing higher pressures closer to the equator or some shit...speculation.
There's shit loads of Strato Volcanoes in these biomes that would be considered grey volcanoes because erupt but they also spew out a shit load of lava and have lava flows. Sakurajima, Ruapehu/Tongariro, Villarrica and countless other Chilean volcanoes, Maybe even Mt Etna could be considered to be in this Biome. Fun question anyway OP I, I didn't even know geologists defined volcanoes as red/grey before.
