"bamboo is a natural high-tech material," says vélez. by using the rapidly growing natural resource in over one-hundred buildings for foundations, roofs, walls and supports he has combined cultural knowledge with ecological needs and advanced technology.

This is all lower case. Can you fix that?
"Bamboo is a natural high-tech material," says Vélez. By using the rapidly growing natural resource in over one-hundred buildings for foundations, roofs, walls and supports he has combined cultural knowledge with ecological needs and advanced technology.