The Charlotte Area Transit System is tapping the brakes on plans to convert to 100% electric buses by 2030. And the slowdown is raising concerns among council members and environmentalists that Charlotte might not be able to meet the city's climate goals.The Charlotte City Council on Monday approved CATS' plan to buy a mix of diesel-electric hybrid buses and electric buses next year — and possibly in future years. Mayor Vi Lyles cast the deciding vote when the 10 members present at the meeting deadlocked 5-5 on the plan.