Why do you think that it’s fairly easy for the sun to fuse hydrogen atoms, but a lot harder to fuse helium atoms?

Because it involves a process called the proton-proton chain.

Explanation:

Two protons (hydrogen-1) fuse together, producing deuterium (hydrogen-2) and other particles plus energy,Deuterium (hydrogen-2) and a proton (hydrogen-1) fuse, producing helium-3 and energy,Two helium-3 nuclei fuse together, producing helium-4, two protons (hydrogen-1), and energy,Helium-3 fuses with helium-4, producing beryllium-7, which decays and then fuses with another proton (hydrogen-1) to yield two helium-4 nuclei plus energy

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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