Either way, food is a big industry and a vital contributor to our culture, but ironically, food is also the biggest problem in the world.

ironically 是由名词 irony（讽刺）加上形容词后缀 -ic 变成 ironic（讽刺的），再加上副词后缀 -ally 构成的副词形式，意思是"讽刺地、具有讽刺意味地"。这个词强调实际情况与表面现象或预期相反的矛盾性。