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Global warming is causing cracks in infrastructure all over the place. Cities in Siberia are falling apart https://www.theguardian.com/cities/2016/oct/14/thawing-permafrost-destroying-arctic-cities-norilsk-russia
nick_h.
Am guessing lots of movement in the ground due to soil drying out. Our patio that was laid last year has opened up in many places as the ground below has dried up, cracked and moved around. You can imagine the damage this would do to old clay pipes.