Being faced with conflicting data; Klein says L&C can't have children, Wells says they can and did, L&C tell Klein of the conflict.
They explain why they believe Wells. Klein decides to remove Clark's powers and do some tests with him powered down. By this time Klein knows that the power transfer is temporary. The human receiving the charge will use it up in time. Clark, with exposure to sunlight, will recharge in time.
While powered down L&C have unprotected sex many times while Klein studies them. Lois becomes pregnant. Clark contracts an STD from Lois. This STD somehow interferes with Clark's ability to process sunlight and power up.
Over the next several years Clark fights a long battle against his illness but gets sicker and sicker. He loses weight. Their child is born and grows up very healthy. By age 10 its clear their child has the beginnings of superpowers.
L&C win many awards and do much good in the world. The New Kryptonians return seeking help from Clark. They have too few people to fill the niches needed by a high tech culture. They are rapidly running thought their stock piles and many irreplaceable machines are failing. They need help, they need a leader. Clark begins a massive but secret transfer of refuges from third world areas to New Krypton. he also recruits folks with the missing but needed skills of farming and the like. He and Lois travel to new Krypton and spend years building the needed infrastructure. Clark forces the New Kryptonian culture to adopt more democratic ways.
The new Kryptonians are unable to cure Clark. At merely 53 years old he dies.
