With the launch of its first foldable smartphone, Apple has quietly surfaced a tension at the heart of modern tech sustainability: the more ambitious the device, the heavier its environmental cost. The iPhone Duo's carbon footprint of 93 kg CO₂e — 69 percent above its predecessor — is not merely a data point but a reckoning, one that travels downstream through every factory and foundry in Apple's supply chain. For Taiwan's electronics manufacturers, the question is no longer whether to decarbonize, but how quickly they can do so before the market answers for them.