The protest coincided with the opening of the UN's COP24 summit in Katowice, Poland, where world leaders gathered to discuss implementation of the Paris Climate Agreement.
"Even as we witness devastating climate impacts causing havoc across the world, we are still not doing enough, nor moving fast enough, to prevent irreversible and catastrophic climate disruption", Guterres told representatives from nearly 200 countries gathered in Katowice, Poland.
The assessment shows over 1 million lives can be saved every year worldwide from air pollution alone by 2050 by meeting the goals of the 2015 Paris agreement.
The Paris accord set a goal of limiting the rise in global temperatures to less than two degrees Celsius by 2030.
Morawiecki said at the conference's Global Climate Action event that, "comparing the various starting points of different countries", Poland boasted "achievements in reducing carbon emissions in the context of the Kyoto Protocol".
He said governments should embrace the opportunities rather than cling to fossil fuels such as coal, which are blamed for a significant share of man-made greenhouse gas emissions.
With just 1°C of warming so far, Earth is blighted by raging wildfires, extreme drought and mega-storms made worse by rising sea-levels.
Over the next two weeks, delegates will try to finalize a plan to limit global warming, but expectations are low.
"This is the challenge on which this generation's leaders will be judged", Guterres said.
Host country Poland is proposing a slow approach to ease the financial blow from move away from fossil fuels.
At COP23, last year, Prime Minister Bainimarama asked WHO to produce a report on health and climate change.