The U.N.’s climate talks are tackling this major hurdle to renewable energy

Outdated power grids are a major hurdle in the transition to renewable energy, since older systems often can’t absorb all the electricity from new, cleaner sources.This threatens global efforts to curb climate change by reducing fossil fuels and switching to renewable energy such as solar and wind. At U.N. climate talks kicking off this week, co-hosts Turkey and Australia want more ambitious goals to slash fossil fuels, install renewables and upgrade grids.Grid concerns are gaining urgency...