Billy Graham is known for proclaiming the Gospel and saving souls, not for science. Yet, he did engage with scientific themes from time to time.
- Here is a very short devotional he did on God and nature.
- In this link he answers a question about conflict between science and religion.
- Here he responds to a graduate student in science wondering about laws of nature and miracles.
- Finally, he comments on experiencing God in nature.
See also some of his reflections on creation care.