The UN expert panel, convened by Guterres after UN climate talks in Glasgow last year, set its sights on drawing a "red line" around greenwashing in net zero targets from companies, cities and regions.A huge surge in decarbonisation pledges in recent months means that around 90 percent of the global economy is now covered by some sort of promise of carbon neutrality, according to Net Zero Tracker.But you have to walk the talk and what we've seen is that there is not enough action," said Catherine McKenna, Canada's former environment and climate change minister, who led the panel.'Do the work'A central recommendation from the panel is that net zero plans must be in line with the Paris Agreement's most ambitious aim of limiting global warming to 1.5 degrees Celsius above pre-industrial temperatures.'Watershed moment'Net zero is "entirely incompatible" with any new fossil fuel investment, the report said, although McKenna said oil and gas companies could still have these pledges if they swiftly transition to renewables."