Tim Keller, a UC Davis alumnus who founded the Inventopia business incubator on Fifth Street in Davis, wants the community to seriously consider adding a lot more homes and population, perhaps to the tune of another 50,000 or 60,000 people over the next few decades. The growth and economic power created by UC Davis require it, he argues, and Davis is behind in meeting that demand. He’s a member of a new pro-growth group, Sustainable Growth Yolo, and explains his reasoning on today’s Davisville. One of his key objectives: Don't sprawl. Build dense.