Mike Johnston, Denver’s new mayor, declared a homelessness emergency on his first day in office and set a goal of housing 1,000 people living without shelter in the city by the end of the year. “We know it’s a crisis that has an impact on our economic recovery, it has an impact on public safety,” Johnston said Thursday, calling the issue a moral crisis during the “State of the City” luncheon held by the Denver Metro Chamber of Commerce. Mayors of Aurora, Boulder and Colorado Springs joined him on stage in calling homelessness a top priority of their administrations, although they haven’t moved as forcefully as Johnston. “We must solve these problems.