The visible problems have started to dissolve but it is only leading to more blindsided issues. These issues include the climate problem. People don't visibly seeing the increase of carbon content in the air, but since the first Earth Day in 1970, carbon levels have increased by 19%. Also, climate temperate has been increasing at a subtle rate that isn't visible to the general public but throws up red flags to scientists.
So, overall, there is still a large amount of work that needs to be done before there will be an affect on climate itself. But since the start of Earth Day 40 years ago, the environmental movement has grown to make large improvement visible to the every day person living in the United States.