The first article defines climate change as changes in climate patterns attributed to increased greenhouse gases like carbon dioxide in the atmosphere. One scientist, Mark Lynes, warns that 3 degrees of warming could melt glaciers and dry out the Amazon rainforest. The second article describes climate change as a long-term shift in weather patterns over decades or longer. Scientists say global warming must be limited to 2 degrees Celsius to avoid irreversible damage. The third article discusses how novel food production strategies like cell-based foods could ensure future food security for Colombia as climate change impacts intensify. It also notes increased atmospheric CO2 levels since pre-industrial times.