Three New Business Models to Achieve Carbon-Reduction Goals NORTHAMPTON, MA | ACCESSWIRE | September 23, 2022 | Tetra Tech: Tetra Tech''s Rodrigo Chaparro, senior climate advisor, looks at three Cooperative Approaches as a market-based path toward net zero in advance of the 2022 United Nations Climate Change Conference (COP27). This is the second in a three-part series exploring how Article 6 of the Paris Agreement can spur the clean energy transition. The most recent Intergovernmental Panel on Climate Change (IPCC) report indicates that around 2,400 gigatons (Gt) of net CO 2 emissions were generated globally from 1850 to 2019. More than 1,000 Gt (42 percent) occurred in the last 30 years. We can only afford another 500 Gt in the next 80 years if we want to limit global warming to 1.5 °C by 2100. This target seems unlikely given current emission reduction pledges set forth in Nationally Determined Contributions (NDCs). "Our best hope for deep emission reductions lies with the energy sector. Cooperative Approaches provide a market-based path forward." Our best hope for deep emission reductions lies with the energy sector.