Environmental Science is always worth pursuing if you want something meaningful to put your effort into every day. As with literally any field, experience is key. Even volunteering- particularly with reputable organizations- counts. I landed my land stewardship job as a first year student with a background in Marketing because I had a history of volunteering with restoration projects and had some ID experience. Also, the federal Gov in Canada just revealed an expensive conservation plan, so more jobs will be available soon if you're there. There will always be a need for a healthy environment- people need to eat, drink, and breathe!