It is simple first you choose your topic and then you can either have it ryme or not.
Answer:
It will be difficult enough to avoid disaster in the next hundred years, let alone the next thousand or million.
"Environment": The circumstances, objects, or conditions by which one is surrounded (Merriam Webster)
"-al" means pertaining to
so environmental means: Pertaining to the circumstances, objects or condition by which one is surrounded.
