by Marco SIBAJA SIQUIRRES, Costa Rica (AFP) — A giant cement structure rises from the river in the middle of Costa Rica’s Caribbean tropical forest, and its turbines spin, each rotation putting the Central American country closer to its goal of relying only on renewable energy. The $1.4-billion Reventazon Hydroelectric Project is the second-biggest infrastructure work in Central America after the just-finished expansion of the Panama Canal, and following six years of construction, it’s nearly […]