From cloud computing to drug discovery: we constantly require more powerful chips that produce highly concentrated heat. Extracting this heat is rapidly becoming a bottleneck for the next generations of computing, as overheating causes chips to fail. Current cooling solutions have an enormous environmental footprint, accounting for about 30% of electricity consumption in data centers. We solve the problem right at the core by integrating micro-scale cooling inside the chip, tailored to its layout. The result: we can extract 10x more concentrated heat with extremely high efficiency to enable computing of the future in a sustainable manner.