A yes vote supported the initiative to do the following:
enact a carbon emissions fee of $15 per metric ton of carbon beginning on January 1, 2020;
increase the fee by $2 annually until the state's greenhouse gas reduction goals are met; and
use the revenue from the fee to fund various programs and projects related to the environment.
Source for Popular Vote data: Washington Secretary of State. November 6, 2018 General Election Results, Washington Secretary of State (https://results.vote.wa.gov/results/20181106/) (accessed 13 Jan 2022)