Former World Health Organization leader Dr Mike Ryan has warned that climate-based migration is set to intensify as global warming reshapes livelihoods and living conditions. Speaking at the MacGill Summer School, he pointed to sub-Saharan Africa as a region where millions have already been pushed to move because of the climate crisis, with far more people likely to follow.
Ryan’s warning places climate displacement among the biggest global challenges ahead. His message suggests that the human pressures created by rising temperatures, extreme weather and environmental decline could surpass many of the crises that currently dominate international attention.
The comments also underline how climate change is increasingly being linked not only to the environment, but to public health, security and social stability. In vulnerable regions, changing weather patterns can damage food production, strain water supplies and make communities harder to sustain, increasing the risk of large-scale movement.
By highlighting the scale of the threat, Ryan added to growing calls for governments and international institutions to treat climate migration as a major policy issue. His remarks reflect mounting concern that without stronger action on climate resilience and adaptation, displacement linked to global warming will deepen in the years ahead.
