By Pratap JohnChief Business ReporterInvestment in renewable power and energy efficiency  could add about 0.8% to global GDP by 2050, boosting the world economy by $19tn, said HE Abdullah bin Hamad al-Attiyah, citing an International Renewable Energy Agency report. ?The Paris Agreement (on climate change) signals that real transformation of the energy sector is the will and undertaking of all world governments,? al-Attiyah said in the Energy Elders  Outlook 2020+? report.