[citation needed] Petro's platform emphasized support for universal health care, public banking, a rejection of proposals to expand fracking and mining in favor of investing in clean energy, and land reform.
[4] Before the runoff, Petro received endorsements from senator-elect Antanas Mockus and senator Claudia López Hernández, both members of the Green Alliance.
[9] The economist Gustavo Petro of Humane Colombia, a former mayor of Bogotá and former M-19 guerilla who was previously a candidate in the 2010 presidential election, ran a populist campaign focusing on decreasing inequality and tackling climate change.
Supported by a coalition of left and centre-left parties, Petro also emphasised workers' rights and campaigned to improve labour conditions in both urban and rural areas.
Critics said his policy proposals would not attract foreign investment and that his plans to abandon non-renewable energy, which accounted for 2-4% of Colombia's GDP, were not feasible at the time.