Like Austin, Denver gets<a href='http://www.metrodenver.org/living-here/climate' target='_blank'> 300 days of sunshine</a> a year, but nowhere near as much rain. Yet even in these harsh conditions, the Denver Botanic Gardens contains more than 32,000 species of plants, and the City Park Arboretum contains more than 3,000 trees. Denver also requires developers to diversify tree species during landscaping and the city keeps records of the age distribution of the canopy and enforces tree ordinances. Denver estimates that $18 million in net income is from tourists visiting their park system.
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