This is the 1316th most frequent Japanese word.
要因
"要因" means "factor" or "cause."
Here, "要因" is used to mean the essential cause or contributing element leading to a particular result, which is 'success'.
成功の要因は継続的な努力です。
The factor of success is continuous effort.
In this context, "要因" refers to a reason or item being identified as influencing the subject matter, specifically 'environmental changes'.
要因として、環境の変化が挙げられます。
As a factor, environmental changes are given.
Here, "要因" denotes the causes or aspects contributing to an undesirable outcome, which here are 'losses'.