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Japan's record-breaking heat and catastrophic flooding back-to-back aren't a coincidence — this is what climate scientists have predicted. A warmer atmosphere holds more water vapor, making extreme downpours inevitable when weather systems move in. Dismissing the link between global warming and these deadly extremes ignores the physics driving these disasters.
Atmospheric CO₂ sits near 428 ppm today — a fraction of the 1,000 to 2,000 ppm that defined the most biologically abundant eras in Earth's history. Blaming floods on trace CO₂ increases of 2 to 3 ppm per year stretches far beyond what the science actually supports. Extreme weather events have always occurred, and pinning them on modern emissions ignores deep geological reality.
Japan has spent years upgrading drainage, yet residents are paying the price again when infrastructure fails in extreme weather. Chiba Station's shopping district looked like a swimming pool after rainfall exceeded 100mm an hour. Governments cannot keep designing for yesterday's averages while today's storms intensify. If officials know the risks are changing, they must build drainage systems for the rainfall Japan is actually experiencing.
The Metropolitan Area Outer Underground Discharge Channel runs roughly 50 meters underground, using kilometers of tunnels, giant storage chambers and powerful pumps to divert excess water toward the Edogawa River. Built through sustained public investment and engineering expertise, Japan's flood-control system shows the country is prepared for extreme weather through ambitious infrastructure, planning and government leadership.