As someone running a pihole off an old radio 2B, your MacBook will be more than sufficient to run what is needed. My only advice would be to get an Ethernet adapter if that model doesn’t have one. Losing valid dns queries due to wifi packet loss would be annoying. Beyond that, just google a guide and go, it’s super straightforward to set up and manage.

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“Animals with pale skin and little fur are most at-risk for sunburns. A few examples are pigs, rhinos, and elephants.” Source

This is why you are elephants cover their backs in mud, it acts as a sunscreen and also helps to keep them cool.

And now I’ve got to be the tertiary guy and point out that if the flow rate into a reservoir is low enough, and the surface area of the lake large enough, evaporation can control the water level. See: aral sea.