It's the one day for Mother Nature, and what better way to do your part for the environment than to be aware of the Earth's situation and do your part about it?

And, if you're the type who prefers to do a small thing that can make a relatively meaningful impact, here are some useful apps that you can download today, and use even after the Earth Day is done.

Artree (iPad)

If you want to create trees but just don't have the time to actually plant them in tree-planting events, here's a handy app that lets you create your own digital tree.

Artree, is an app that makes use of algorithms to grow beautiful trees at the touch of your fingertips. It gives a new meaning to the term "green thumb" as you can choose to create just one tree or go for a forest mode, both in landscape or portrait formats, reports Design Year Book.

From creator Hansol Huh, it's the perfect Zen app that lets you use your imagination to create trees, be they the type you see in your backyard or those you picture in your head.

The images that you create can then be saved as wall papers or even illustrations and designs. So you can either create tree images as web designs or use it as the cover for your recycled notebook.

Sure, it won't exactly impact the environment in a way, but it lets you indulge the tree lover in you.

Recycle Hero for Kids

Let your kids in on some Earth Day fun while also teaching them the meaning of what it is to be a hero for Mother Nature.

In Recycle Hero for Kids, an app from Yogome, Inc., kids will battle Queen Ignorantia, who keeps dumping garbage on the planet.

USA Today reports that the game has 36 puzzles good for kids ages 5 to 12, and they'll learn how to sort out different garbage types, shoot down garbage falling from the sky, and even learn about pollution through these puzzles.

You can get it at $1.99 to $2.99 in iOS or Amazon, but in Android, you can get it for free as "Educational Games for Kids."

PaperKarma

A lot of things are shifting to digital, but it seems that the one main thing that won't easily go away would be the junkmail you get, be they for grocery coupons or other services.

These may usually be your old subscriptions that you just never got around to canceling, which is why PaperKarma can be a great way to get rid of the waste of paper.

Now available on the iOS, Android, and Windows 8, this app is simple to use. All you have to do is take a photo of the unwanted envelope and the app will have you removed from the sender's mailing list, reports Oregon Live. You can even track the progress to see if you have been removed from the mailing list.

iRecycle

Earth Day makes everyone more aware of the waste they throw, and it's the best day to do a bit of spring cleaning in your home and do some recycling yourself.

If you have a lot of junk in your home already, and no place to bring them to, iRecycle is the perfect app for you to use. According to SlashGear, it gives you 12 main options of what kind of trash to throw.

Then you can sort out what exactly that type of trash is from the other categories below the main one. Afterwards, you'll get a screen featuring your location as well as a list of places nearest you where you can recycle the items. You can even visit the website of the location, get the address, or call them up, using all the information from iRecycle.

Best of all, this app is free, and, depending on the recycling company, you might even make some extra cash for your recycling efforts.

Avego

Carpooling is a great way to do your part for the environment, especially for those who are driving cars alone. Connect with other commuters via Avego, a carpooling app, and you may even save a bit of money for gas, since you'll be sharing with your fellow commuter.

To operate this kind of system, you'll make use of GPS, both for the driver and rider, to arrange the pickups. You'll have to show your companion a photo of yourself, and, to ensure safety, the rider will be sent a PIN number, which the driver will encode to ensure that the right passenger is riding with him, reports The New York Times.

While the issue of safety here may be pressing, it might help to know that Avego has been commended by the likes of The New York Times, ABC News, GigaOM, and The Seattle Times.