The variable measures the share of votes to the lower chamber received by the parties, for which environmental protection is relevant to gain and keep voters, as agreed on by at least half of the coders in the V-Party dataset.

The original variable from V-Party dataset - v2pasalie - reports the share of coders who answered "12: Environmental protection" to the multiple-choice question "Which of the following issues are most relevant for the party's effort to gain and keep voters?". We only keep parties that score 0.5 or higher on variable v2pasalie_12 and then calculate their share of votes in a given country-year using v2pavote variable - Vote share the party gained in the election to the lower chamber.