Passengers in general, it stated, are becoming increasingly aware of the environmental effects of air travel, and Eurostar services emit much less carbon dioxide.[136] and that its remaining carbon emissions are now offset, making its services carbon neutral.[137][138] Further expansion of the high-speed rail network in Europe, such as the HSL-Zuid line between Belgium and the Netherlands, continues to bring more destinations within rail-competitive range, giving Eurostar the possibility of opening up new services in future.