Some $150bn was invested in clean energy in developing economies last year, according to new International Energy Agency (IEA) analysis. But the Agency believes this figure must hit $1trn by 2030 to deliver a net-zero world.The new analysis, published today (9 June) as part of a collaboration with the World Economic Forum (WEF) and World Bank, assesses the investments made in renewable generation, nuclear generation, biofuel generation and related technologies in recent years.