Answer by taking a quote from the following article:

Earth Crisis is an American metalcore band from Syracuse, New York, active from 1989 until 2001, reuniting in 2007. Since 1993 the band's longest serving members are vocalist Karl Buechner, guitarist Scott Crouse, bassist Ian Edwards and drummer Dennis Merrick. Their third guitarist Erick Edwards joined the band in 1998. The band has released eight studio albums, three compilations, two live albums and six music videos.

The name of the band, Earth Crisis, indicates how their members see the current state of the planet and in their lyrics they seek to offer solutions to it; these are either "educational" or encourage direct-action. Most of them focus on rejection of recreational drugs, animal products, animal testing, industrial livestock production, illegal drug trade and an impending earth's doom caused by wars or an ecological collapse. On the other hand, they promote straight edge, veganism, self-empowerment and organizations such as Earth First!, Sea Shepherd Conservation Society and the Animal Liberation Front. In the words of the academic Jonathan Pieslak, some of their lyrics "read like passages" taken from "direct-action essays" of these institutions. Other subjects include criticism against white supremacy and, especially on Breed the Killers, oppressive governments. 2000's record Slither incorporated more topical issues, such as genetic engineering and second amendment rights. Their seventh and eighth albums, Neutralize the Threat and Salvation of Innocents, are concept albums entirely dedicated to real-life vigilantes and animal rights/anti-vivisection, respectively. The albums All Out War, Gomorrah's Season Ends and Breed the Killers included essays that delve into their lyrics and beliefs. According to the sociologist Ross Haenfler, Earth Crisis combined "youth crew's outspoken commitment to straight edge with Manliftingbanner's direct politics".  In a 1998 interview with Roadrunner Records, Karl Buechner described Earth Crisis' philosophy: "I want to boil it down to one notion: personal accountability. Respect for yourself, respect for the lives of innocent beings around us." He added that "Just being drug-free doesn't make you a good person, you need to use that clarity of the mind to become actively involved in the struggle that is being waged for earth, human and animal liberation." Their message disjoined from the "posicore" attitudes in its advocation for violent direct action. However, they believe that it must be used only as a last resort: "destruction and violence are the last thing I want to see but tragically, they are sometimes necessary. We place so far greater value on the lives of the innocent beings than any type of worth that could be put upon someone who's sadistic or greedy and doesn't want to change their profit system", said Buechner.  The band cited authors Peter Singer, John Robbins and Huey P. Newton as inspirations. In their live shows, there is usually literature about PETA, Greenpeace and others distributed. They have been longtime supporters for organizations such as the Animal Defense League, having done several benefit concerts for them. Nevertheless, they are not part of any of these groups or a political party: "We're about things we're interested in and we sing about things that happen politically, but we're not left-core or right wing. We don't want to get tangled up in someone else's agenda, which can happen if you join up in certain organizations."  Earth Crisis was occasionally misidentified with the hardline subculture, but they are not against homosexuality and believe that abortion should remain as an option in some instances. They also do not have a religious agenda and think that that is mainly a personal choice.

What was one of their greatest successes?
The albums All Out War,