* Graphics on cost of offshore wind: https://tmsnrt.rs/2Re2b2k (Adds detail, CEO, background): COPENHAGEN (Reuters) - Denmark’s Orsted will invest $30 billion in green energy up to 2025, it said on Wednesday, as it seeks to become one of a handful of future “renewable majors” leading a global transition from fossil fuels to green energy. While renewable energy technology is now able to compete with traditional power sources, the industry remains vulnerable to changing political winds as governments around the world scramble on how to address climate change.