Yes. And I have received the first one through my email, with a small note:

“Since environmental considerations are an integral part of Apple’s business practices, Apple Training and Certification is pleased to introduce a new Green certificate fulfillment process. Beginning August 1, paper certificates will no longer be sent to Mac OS X and Pro Apps students who pass certification exams. Instead, students will receive an email with a link to download a PDF version of their certificate at no charge. Students will be able to print these certificates, but we hope that most will choose to simply post the PDF certificates on their websites. This new system will be available worldwide.” - Apple Training

In the past, certified trainees & trainers will receive via a courier, a printed certificate, with a silver Apple Logo embedded on them and would look sleek in a frame.

As of now, this is what the certificate will look like and trainees have the option to print it themselves, on a recommended paper and printer-type:

PDF version of Certifications by Apple.

So, I can foresee that my future training materials (eg. Books, notes) will be on PDFs as well; so more trees will be saved eventually!

Way to go Apple!