Depends on how one defines "environment".
In a number of locales there is a lot of irrigation coming from aquifers that have long time constants for refreshing - that could be influencing local temperatures though I haven't seen any real studies. Plus water in air concentrations are affected by air temperature and could be a major feedback to be considered.
Let’s be serious. We have 3/4 of the earth’s surface composed of water, often miles deep, directly exposed to the air and able to evaporate whenever the conditions allow it. On a worldwide scale we aren’t capable of increasing the amount of water in the atmosphere. Although if global warming kicks in there could be a slight increase, as warmer air is able to hold more water vapor.
Local humidity conditions can certainly change due to human influence. Phoenix is well known for having higher humidity than it used to, due to all the irrigation in the valley.