Environmental groups stepped up planning this week for an expected wave of protests on April 29 to mark President Trump's 100th day in office.

Trump's 100-day agenda has been chock full of actions environmentalists oppose, including the rollback of Obama-era climate change regulations, measures to increase coal and fossil fuel production, and the proposed gutting of the Environmental Protection Agency.

The Peoples Climate March, which is what the day of protest is being called, is environmentalists' response to Trump's actions.

"The Peoples Climate March couldn't have come at a more important time," said Rhea Suh, president of the Natural Resources Defense Council, in a Wednesday message to supporters. "Last week, Trump unleashed his biggest climate attack yet, signing a disastrous executive order that rolls back the landmark Clean Power Plan among other assaults on our environment and our health.

"Those threats came on the heels of the president's recent proposal to slash the EPA's budget by 31 percent and his administration's decision to bulldoze ahead with the Keystone XL and Dakota Access pipelines," she said.

The day of protest was formally announced last week after Trump signed his Energy Independence Executive Order to roll back the Clean Power Plan, the centerpiece of former President Barack Obama's climate agenda, while upending all executive actions related to greenhouse gas emissions and global warming.

This week, planning for the event moved into force with major groups such as Suh's launching an online portal to help activists across the country hold their own local demonstrations if they can't attend the main protest being held in Washington.

Suh's goal is to have Trump's 100th day in office marked by the "most exciting, game-changing climate mobilization in history."

The day of protest appears to be taking precedent by some green groups over April 22 Earth Day celebrations that are typically used to highlight environmental causes.

The "March for Science" in Washington is slated for Earth Day, and will highlight the need for studying the effects of manmade global warming on the Earth. But it is also more generalized and will focus on all disciplines of science including astronomy and medical research.

Suh didn't mention Earth Day once in recent messages to supporters. Activist groups taking to social media in the last 24 hours to promote the day of protest did so without any talk of Earth Day.

Former President Al Gore's Climate Reality Project, Greenpeace and others were too busy promoting the April 29 protest on Twitter.

"Donald Trump's attacks on people and planet are getting bolder by the day. So are we. April 29, join #ClimateMarch," the group 350.org tweeted.

"Everything we have struggled to move forward in the United States is in peril," said 350.org's registration page for the march. "To change everything, we need everyone."

On Twitter, Earth Day has been relegated to the background of environmental causes. It is primarily the bastion of industry and government looking to promote tree growing and conservation.

NASA has one of the more popular retweets for its "Adopt the Planet" program, where it "invites you to help us celebrate Earth Day 2017 by virtually adopting a piece of Earth as seen from space.

"Your personalized adoption certificate will feature data from NASA's Earth-observing satellites for a randomly assigned location," the government's space agency pointed out. What it doesn't say is that Trump's budget proposal would kill off the Earth observation program.