The PhD is a doctoral degree, specifically called a "doctor of philosophy" degree. This is misleading because PhD holders are not necessarily philosophers (unless they earned their degree in philosophy!). That said, PhD recipients are able to engage in thought experiments, reason about problems, and solve problems in sophisticated ways.
The people, language, and culture of the Netherlands is referred to as "Dutch". A modern European country today, Netherlands preserved its highly international character and is known for its liberal mentality. The Netherlands has many universities. The country has recently converted their own titles into the bachelor/master system. There are two types of universities: Academic (focussing more on theoretical knowledge, aka "Universiteit") or Applied Sciences (focussing more on practical knowledge, aka "Hogeschool")
Top Doctoral Programs in Sustainability in Netherlands 2018
or search for similar programs here